词典释义：
the lowest point or part of something
底部，底层
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the bottom of the page
页面底部
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she paused at the bottom of the stairs .她在楼梯底下停了片刻。
the ground under a sea, river, or lake
（海、河或湖的）底，底部
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the liner plunged to the bottom of the sea .飞机坠入了海底。
the inside or outside of the lower surface of something
某物内部（或外部）的底部
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place the fruit on the bottom of the dish .把水果放在碟子的底部。
the seat of a chair
（椅子的）座部，座面。
the furthest part or point of something
远端，尽头
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the shed at the bottom of the garden .花园尽头的小棚子。
the lowest position in a competition or ranking
底层；最低下的部分
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he started at the bottom and now has his own business .他从最底层做起，现在已经有了自己的事业。
(亦作
（两件套衣服的）下半身（如睡裤）
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a pair of pyjama bottoms 睡裤
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a skimpy bikini bottom .性感的比基尼泳裤。
the keel or hull of a ship
龙骨，船体。
〈古〉 船（尤指货船）。
[mass noun]
〈古〉 （尤指马的）持久力，耐力。
〈主英〉 臀部；屁股
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Toby pinched her bottom .托比掐她的屁股。
[mass noun]
底夸克
in the lowest position
最底层的，最下的
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the books on the bottom shelf .底层架子上的书。
(of a place)in the furthest position away in a downhill direction
（下山方向的）最远处的
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the bottom field .山下远处的田野。
in the lowest or last position in a competition or ranking
（在竞赛与排名中）最后的，最差的
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I was put in the bottom class 我被安排在了最差的班级
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they came bottom with 17 points .他们仅得了１７分，排名最后。
(of a ship)reach or touch the ground under the sea
（船）到达海底，触到海底
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nuclear submarines cannot bottom .核潜艇不能沉到海底。
(of a performance or situation)reach the lowest point before stabilizing or improving
（成绩，局势）到达最低点后趋于平衡；走出低谷
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encouraging signs suggested the recession was bottoming out .令人鼓舞的迹象表明经济萧条正在走出低谷。
[with obj.]
〈澳／ 新西兰〉 钻探…直到矿物层。
〈澳／ 新西兰〉 勘探到金子（或其他矿物）
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he's bottomed on opal there .他在那儿找到了蛋白石。
〈古〉 发现…范围（或本质）。
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at bottom basically； fundamentally 基本上，本质上at bottom ,science is exploration ．本质上，科学就是探险 -
be at the bottom of be the basic cause or origin of （something） 是…真正的起因（或根源）he knew what was at the bottom of it —Jane wanted them to live together ．他知道真正的原因—— 简希望他们能生活在一起 -
the bottom falls （或drops ）out used to refer to the sudden collapse or failure of something 出现暴跌（或垮台）的局面the bottom fell out of the market for classic cars ． 高级轿车市场暴跌 -
bottoms up! informal used to express friendly feelings towards one's companions before drinking 〈非 正式〉 干杯！from the bottom to one's heart 见HEART ．from the bottom up starting at the lower end or beginning of a hierarchy or process and proceeding to the top 从最底层做起；从头学起we began to study history from the bottom up ． 我们从头学历史 -
get to the bottom of find an explanation for （a mystery） 探明…的真相；弄清…的起因；寻到… 的根子 -
knock the bottom out of cause （something） to collapse or fail suddenly 使突然坍塌（或失败）a shortfall in supplies would knock the bottom out of the engineering industry ． 物资供应不足会使机械制造业崩溃 -
you （can ）bet your bottom dollar informal ,chiefly N ．Amer ． used to state one's conviction that a particular thing is going to happen 〈非正式，主北美〉 深信，确信you can bet your bottom dollar it'll end in tears ． 可以确信，这定会以眼泪收场
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river bottom 江底/河底
真题例句：
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from top to bottom 从上到下；彻底地
真题例句：
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at the bottom of ... 在…的底部
真题例句：
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from the bottom of one’s heart 发自内心的；诚心诚意的
真题例句：
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the bottom drawer 最下面的抽屉
真题例句：
"Old English
