1、walking，英 [ˈwɔːkɪŋ] 美 [ˈwɔːkɪŋ] n.行走;步行;散步;徒步旅行;竞走。

2、such as large brains and the ability to walk upright on two legs ．比如大的大脑和两腿直立行走的能力。

3、A treadmill is an exercise machine that lets you walk in one place. 跑步机是一种可以让你在原地进行行走的锻炼机器。