foot和at the feet

① at the base意为“在底部；基础”。

There is a waterproof layer at the base of the building. 楼房的底部有防水层。

We camped at the base of the mountain. 我们在山麓宿营。

② at the bottom意为“在底部，在下面”。

They found a sunken ship at the bottom of the lake. 他们在湖底发现一艘沉船。

Please consult the notes at the bottom of the page. 请参看书页下面的注解。

③ at the foot意为“在底层，在基部，在……下端”。

There is a lake at the south foot of the mountain. 在山的南麓有一个湖。

They used to be at the foot of the social ladder. 他们过去是在社会最底层。

at the bottom of