bed
单词辨析：
词义最广泛，可指各种事物的最底端部分。
Hold the bottom of the ladder for me, please!
请帮我扶住梯子下部！
Be careful! The bottom of the pool is very slippery.
小心！池底很滑。
So many fish live on the sea bottom.
生活在海底的鱼数量繁多。
指构成某物底部的一层，也指河、湖、海等的水底部分。
on the sea bed
在海底
the bed of a river
河床
All the child wants is the prawns on a bed of lettuce.
这个孩子只想吃铺在生菜上面的大虾。
The railway was built on a bed of solid rock.
铁路建在硬石地基上。
指海洋、山洞等的底，或建筑物中的地板、地面。
creatures living on the ocean floor
生活在海底的生物
the floor of a bridg
桥面
He left his books lying all over the floor.
他把书扔得满地都是。
相关例句：
I'm going to go to bed
我要睡觉了。
We're a bit low on bed linen
我们的被单枕套有点不够了。
I decided to ditch the sofa bed.
我决定把沙发床扔了。
The geraniums in the flower bed looked bedraggled from the heavy rain.
花坛里的天竺葵被大雨浇得七零八落。
When she had gone Sam and Robina put the children to bed.
她走了以后，萨姆和罗宾娜就安顿孩子们上床睡觉了。
Between the white limestone and the greyish pink limestone is a thin bed of clay.
在白色石灰石和粉灰色石灰石之间是一层薄薄的黏土。