Each year from one to three of every 1,000 people develop blood clots which block the veins, usually in the legs or thighs.

每年，每1000人中就有1到3人会发生血栓阻塞静脉，通常是小腿或是大腿。

youdao

When we think about animal locomotion... whether it's walking, running, or just standing around... we usually focus on the bones and muscles in the legs and feet.

每次说到动物的活动——无论是踱步、奔跑抑或只是静止不动，我们总是注意到这些活动中四肢骨骼及肌肉的变化。

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Relay RACES incorporate all the techniques of sprinting, especially the fast baton handoff in highly intensive competition. But the first and final legs usually play the most critical role.

接力项目包括了短跑的所有技术，尤其是要在高度紧张的竞争中完成接力棒的快速传接。但起关键作用的还是第一棒和最后一棒。

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One victim in two hundred suffers permanent paralysis, usually in the legs.

VOA: special.2010.01.18

Buerger's disease usually first shows in the hands and feet and may eventually affect larger areas of your arms and legs.

CNN: Buerger's disease