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n (1) 底，底部(lowest part or point of sth outside or inside)[C，通常sing][N(of)]：at the～of the stairs/the mountain在樓梯/山腳下;at the～of the slope/the wall/the valley/the pile在斜坡/墻/山谷/堆的底部;at the～of the page/the list在書(shū)頁(yè)/名單的最末處;at the～of the steps/one's trouser legs在臺(tái)階的最低幾級(jí)/褲腿邊處; at (in/on) the～of the cup/the box/the trunk/the basket/the well 在杯子/盒子/皮箱/籃子/井的底部(上);oars in the～of a boat放在船底部的槳; barnacles on the～of a boat長(zhǎng)在船底上的藤壺貝;B～s up! (infml)干杯! 〖同〗base，foot;〖反〗 top，summit，peak;

(2) (海，湖，河之)底，水底(solid surface under a sea， lake or river)[C，the～][N(of)]：at/on the～of the sea/the lake/the river在海/湖/河底;(diver/ship) go/sink to the～(潛水員/船)沉入水底;send an enemy ship to the～把敵船打沉海底;The water is very deep here; I can't touch (the)～. 這兒水很深，我夠不著底。〖同〗riverbed，depths;〖反〗surface;

(3) 屁股 (part of the body on which one sits) [C]：fall on one's～摔個(gè)屁股墩;smack/spank a child's～打小孩的屁股;

(4) 末端，遠(yuǎn)處(farthest part or point (of sth)? far end (of sth))[C， the～][N(of)]：at the～of the road/the garden 路的盡頭/花園深處;down at the～of the meadow在草地的盡頭;sit at the～of a long table 坐在長(zhǎng)桌子的盡頭;

(5) 最(末)(lowest place or position in a class， list， etc)[C，the～][N(of)]：He is always (at) the～of the class in science.他的理科(成績(jī))在班上總是墊底。Who came～in the exam? 這次考試誰(shuí)是最后一名? He started at the～(of the ladder)， and worked his way up to success/to become a president. 他從最底層干起，卻奮斗成功了/成了總統(tǒng)。Officials at the top make the decisions; men at the～carry them out.上層官員做決定，下層人員去執(zhí)行。

(6) 起點(diǎn)(因)(the starting point; the cause)[C，the～][N(of)]：Who is at the～of all this trouble/these rumours? 誰(shuí)是這起糾紛的禍?zhǔn)?這些謠言的制造者?～line 決定性因素;

(7) 套服的下身(lower part of a two-piece garment)[C，通常pl]：pyjama/track suit～s 睡褲/運(yùn)動(dòng)褲;

at bottom 實(shí)際上，根本上：He pretends to be very bold， but he's really a cowardly man at～.他假裝很膽大，實(shí)際上卻很膽小。

from the bottom of one's heart由衷地：I thank/congratulate you from the～of my heart.我真心感謝/祝賀你!

get to the bottom of 弄清……的原因(真相)：Let's get to the～of this (mystery/matter/problem). 咱們來(lái)把這(奧秘/事/問(wèn)題)弄清楚。

→′bottomless adj 無(wú)底的，很深的;無(wú)限的，用不完的;′bottommost adj 最低的;

adj 最低(后)的 (lowest or last)：in the～row在最后一排;on the～step of the stairs在樓梯最低一級(jí);the book on the～stack/shelf書(shū)架最底層的書(shū);the～button of a waistcoat/rung of a ladder坎肩最底下的扣子/梯子最低一級(jí);the～line on a page一頁(yè)的最后一行;～prices最低價(jià);go in～gear以最慢檔行駛;〖同〗lowest，deepest;〖反〗highest，uppermost，upper;

bottom out (v adv) 降到最低點(diǎn)(vi)：The crisis/recession has～ed out.危機(jī)/蕭條已達(dá)到最嚴(yán)重的程度。House prices have～ed out.房?jī)r(jià)已降到最低水平。