feet是foot 的复数。

foot ：n.(人或动物的)脚，足；

v.走，踏；

相关介绍

The country has been on a war footing since March.

自三月份起这个国家就准备要打仗。

She put her foot down and the car roared away.

她踩下油门，车子呼啸而去。

The city is best explored on foot.

最好是徒步考察这个城市。