- the lowest point or part of something底部, 底层：
the bottom of the page
页面底部
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：
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：
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：
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：
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bottoms）the lower half of a specified garment in two pieces（两件套衣服的）下半身（如睡裤）：
a pair of pyjama bottoms
睡裤
a skimpy bikini bottom.
性感的比基尼泳裤。
- the keel or hull of a ship龙骨, 船体。
- archaic a ship, especially considered as a cargo carrier〈古〉船（尤指货船）。
- mass noun archaic stamina or strength of a character, especially of a horse〈古〉（尤指马的）持久力, 耐力。
- chiefly Brit. the part of the body on which a person sits; a person's buttocks〈主英〉臀部; 屁股：
Toby pinched her bottom.
托比掐她的屁股。
- mass noun Physics【物理】one of six flavours of quark底夸克
- in the lowest position最底层的, 最下的：
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：
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：
I was put in the bottom class
我被安排在了最差的班级
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：
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：
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. Austral./NZ excavate (a hole or mine) to the level of a mineral-bearing stratum〈澳/新西兰〉钻探…直到矿物层。
- Austral./NZ find gold or other minerals while mining〈澳/ 新西兰〉勘探到金子（或其他矿物）：
he's bottomed on opal there.
他在那儿找到了蛋白石。
- archaic find the extent or real nature of〈古〉发现…范围（或本质）。
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。
bottomed
adjective玻璃底船
bare-bottomed toddlers
光脚学步的婴儿