n.

1. 脚印，足迹[C]
   They noticed some footprints in the snow.

   他们注意到雪地里的一些脚印。

n.

1. the impression left by a foot or shoe on the ground.
2. the impact on the environment of human activity in terms of pollution, damage to ecosystems, and the depletion of natural resources.
3. the area in which a broadcast signal can be received.
4. the area beneath an aircraft or a land vehicle which is affected by its noise or weight.
5. Computing  the space taken up on a surface by a piece of hardware.