底部的英文：
bottom

参考例句：

A horny growth on the heel of a horse's hoof.
马蹄底部的角质层

Families at the Base of a socioeconomic pyramid
位于社会经济结构底部的家庭

It taps continuously from the base of the receiving ladle.
它从贮钢包的底部连续流出。

It's tap continuously from the base of the receiving ladle.
它从贮钢包的底部连续流出。

The air is trapped beneath by a metal lining round the lower sides of the craft.
空气被圈在一个在气垫船底部的金属套筒内。

A temperature stratification from the top to the bottom of the plenum is obtained
从压力通迅室的顶部到底部可获得分层气流温度。

A cylinder is a hollow tube with a closed concave base that permits it to stand upright.
钢瓶是中空的管道，封闭的底部是凹入的，这样可以直立起来。

What's this horrible gunge in the bottom of the bucket?
水桶底部黏乎乎怪恶心人的东西是什么？

possum belly
[美俚]火车车箱底下的贮藏室,车辆底部的藏物处

"Growing or directing upward from a curved or slanted base, as certain plant stems."
从一弯曲或倾斜的底部向上生长或上指,如某些植物的茎。

bottom是什么意思：
n. 底部；末端；尽头；臀部
adj. 底部的
v. 装底；建立基础；到达底部

reach the bottom
到达底部

Get to the bottom of
弄个水落石出

Look, the bottom is bubbly!
看，鞋底有有很多泡泡呢！

plow bottom for sod and clay
草皮粘土地犁体

general-purpose bottom
通用犁体