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plain
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音标：英 [pleɪn] 美 [plen]
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解释：
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adj. 平的；简单的；朴素的；清晰的
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n. 平原；无格式；朴实无华的东西
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adv. 清楚地；平易地
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n. (Plain)人名；(英)普莱恩；(法)普兰
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助记提示：
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1. 因为简单、平白、坦率，自然就很容易看清楚、看明白。=> 清楚的、明白的、明显的。
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中文词源：
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plain 平原，平地，明显的，直白的，简单的，素的来自拉丁语planus,平的，来自PIE*pele,展开，放平，词源同plan,place.引申诸相关词义。
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英文词源：
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plain
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plain: [13] Plain is etymologically the same word as plane in all its uses except the tree-name, and even that comes from the same ultimate source. This was Indo-European *plā- ‘flat’, which produced Greek platús ‘broad’ (source of English place, plaice, and platypus), Latin plānus ‘flat, clear’, and possibly English flat. The Latin word passed into English via Old French plain, but its original ‘flat’ senses have been hived off into the separately acquired plane, leaving only the metaphorically derived ‘clear’ senses. The Italian descendant of plānus has given English piano.
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=> plane
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plain (adj.)
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c. 1300, "flat, smooth," from Old French plain "flat, smooth, even" (12c.), from Latin planus "flat, even, level" (see plane (n.1)). Sense of "evident" is from, c. 1300; that of "free from obstruction" is early 14c.; meaning "simple, sincere, ordinary" is recorded from late 14c., especially of dress, "unembellished, without decoration."
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In reference to the dress and speech of Quakers, it is recorded from 1824; of Amish and Mennonites, from 1894 (in the Dutch regions of Pennsylvania Plain with the capital is shorthand adjective for "Amish and Old Order Mennonite"). Of appearance, as a euphemism for "ill-favored, ugly" it dates from 1749. Of envelopes from 1913. As an adverb from early 14c. Plain English is from c. 1500. Plain dealer "one who deals plainly or speaks candidly" is from 1570s, marked "Now rare" in OED 2nd edition. To be as plain as the nose on (one's) face is from 1690s.
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plain (n.)
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"level country," c. 1300 (in reference to Salisbury Plain), from Old French plain "open countryside," from Latin planum "level ground, plain," noun use of neuter of planus (adj.) "flat, even, level" (see plane (n.1)). Latin planum was used for "level ground" but much more common was campus.
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双语例句：
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1. It's plain that he adores his daughter, and the feeling is mutual.
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明摆着他很喜欢自己的女儿，而且女儿也喜欢他。
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来自柯林斯例句
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2. Patterson pointed toward a plain cardboard box beneath a long wooden table.
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帕特森指着长木桌下的一个普通的纸板箱。
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来自柯林斯例句
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3. Pregnancy wasn't all plain sailing and once again there were problems.
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孕期并非一帆风顺，这不，又出现问题了。
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来自柯林斯例句
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4. It is stranded somewhat forlornly in the middle of the plain.
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它有些孤零零地立在平原中央。
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来自柯林斯例句
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5. He wore a plain blue shirt, open at the collar.
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他穿一件素净的蓝色衬衫，领口敞着。
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来自柯林斯例句
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更多相关例句：
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He made it plain that we should leave.
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他明确表示要我们离开。【牛津词典】
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She made her annoyance plain.
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她满脸不耐烦。【牛津词典】
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The facts were plain to see .
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事实显而易见。【牛津词典】
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It was a rip-off, plain and simple .
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这是一个不折不扣的冒牌货。【牛津词典】
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The plain fact is that nobody really knows.
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事实很明显，没有人真正了解。【牛津词典】
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a politician with a reputation for plain speaking
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说话直率出了名的一个政治人物【牛津词典】
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a plain but elegant dress
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朴素淡雅的连衣裙【牛津词典】
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plain food
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清淡的食物【牛津词典】
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The interior of the church was plain and simple.
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教堂内部朴素无华。【牛津词典】
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plain yogurt (= without sugar or fruit)
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原味酸奶【牛津词典】
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covers in plain or printed cotton
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单色或印花的罩布【牛津词典】
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Write on plain paper (= without lines) .
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用无格白纸书写。【牛津词典】
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You don't need any special skills for this job, just plain common sense.
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这项工作不需要任何特殊技能，只要有普通常识就够了。【牛津词典】
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the flat coastal plain of Thassos
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萨索斯岛平坦的滨海平原【牛津词典】
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the Great Plains
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北美洲大平原【牛津词典】
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plain stupid/wrong
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简直愚蠢至极；绝对错误【牛津词典】
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In general, a plain carpet makes a room look bigger...
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一般来说，单色的地毯使房间显得更宽敞。【柯林斯高阶英语词典】
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He placed the paper in a plain envelope...
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他把论文装进一个空白信封里。【柯林斯高阶英语词典】
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Bronwen's dress was plain but it hung well on her...
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布朗温的长裙虽然朴素，却很合身。【柯林斯高阶英语词典】
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It was a plain, grey stone house, distinguished mainly by its largely unspoilt simplicity.
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这是一幢简朴的灰石房子，主要以其天然简约的风格显得与众不同。【柯林斯高阶英语词典】
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It was plain to him that I was having a nervous breakdown...
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他能明显地看出我快要精神崩溃了。【柯林斯高阶英语词典】
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He's made it plain that he loves the game and wants to be involved still.
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他明确表示自己热爱这项运动，并仍想参与其中。【柯林斯高阶英语词典】
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...a shy, rather plain girl with a pale complexion.
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肤色苍白、相貌平平的害羞女孩【柯林斯高阶英语词典】
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Once there were 70 million buffalo on the plains.
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北美大平原上曾有过7,000万头野牛。【柯林斯高阶英语词典】
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The food was just plain terrible.
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这食物实在太难吃了。【柯林斯高阶英语词典】
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Why couldn't they call you plain Ann or Alice like the rest?
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他们为什么不能像其他人一样，给你取个普普通通的安或艾丽斯的名字呢？【柯林斯高阶英语词典】
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Three officers in plain clothes told me to get out of the car.
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3名便衣警察让我下车。【柯林斯高阶英语词典】
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As for the taxi drivers, most are delighted to be behind the wheel of new cars,although there have been a few complaints about switching from black and white to a plain white colour.【2015年12月四级真题（第一套）听力 Section A】
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Subsidise companies to adopt plain packaging.【出自-2016年12月阅读原文】
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Plain packaging would be another step in the reclassification of cigarettes from inviting consumer products to narcotics ( ' , 麻醉剂).【出自-2016年12月阅读原文】
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Plain packaging discourages non-smokers from taking up smoking.【出自-2016年12月阅读原文】
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MPs voted overwhelmingly in favour of Labour amendments to the children and families bill last February that included the 118 power to regulate for plain packaging.【出自-2016年12月阅读原文】
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Evidence from Australia suggests plain packaging pushes society further along that road.【出自-2016年12月阅读原文】
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Rising more than 1,000 feet in the middle of the gently rolling plains of Wyoming, the massive column of rock looks as though it was dropped down into this location from a different time and place.【出自-2016年12月听力原文】
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They are interesting for the fact that they are very plain and undecorated for the time, with only one plain central panel at the back and no armrests.【出自-2013年12月听力原文】
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We can tear apart the great grass cover of the western plains and pour toxic chemicals into the soil until the soil is dead and blows away in the wind.【出自-2013年12月听力原文】
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MPs voted overwhelmingly in favour of Labour amendments to the children and families bill last February that included the power to regulate for plain packaging.【2016年12月六级真题（第三套）阅读 Section C】
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similar studies tested whether students learned basic physics and chemistry concepts better by reading plain text or viewing pictures to and everyone do better with the help of pictures.【2019年12月六级真题（第二套）听力 Section C】
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Instead, he says, firms should provide a plain-English version of their terms.【2016年高考英语上海卷 阅读理解 阅读C 原文】
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Read the syllabus and learning management system information to be sure the answer isn't hiding in plain sight.【2019年高考英语全国卷3 阅读理解 七选五 原文】
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