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。
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。
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。
There are no flip turns to negotiate in marathon swimming, which is usually held in lakes and oceans, and the upper body is more important than the legs.
这种马拉松式游泳一般在湖泊或海洋中进行，不需要突然发力和转身，而且上半身的动作比腿部更关键。
It is frequently severe and usually presents as an ascending paralysis beginning as weakness in the legs that spreads to the upper limbs and the face along with complete loss of deep tendon reflexes.
经常表现严重并且通常表现为上升性瘫痪，最初表现为腿部无力并扩展至上肢和面部，伴随着深感觉的完全丧失。
A sturdy, usually rectangular table with flush surfaces and straight, block legs that are equal in thickness to the top of the table and form its four corners.
一种有齐平桌面且牢固的通常为长方形的桌子，桌腿直而粗，其厚度与桌面相等并形成桌子的四个角。
Although they usually occur in the legs, varicose veins also can form in other parts of the body.
尽管静脉曲张常发生于腿部，但其也可形成于身体的其他部分。
Spiders are called spiders because they usually visit many sites in parallel at the same time, their "legs" spanning a large area of the " web".
蜘蛛程序之所以被叫做这个名字，是因为它同时能并行地访问多个网站，其“腿”可以跨在“网”上很大一片区域。
Symptoms of an occurring stroke are numbness or weakness in the face, arms, or legs (usually only on one side of the body), confusion, severe headache, decreased vision, and dizziness.
症状的发生中风麻木或虚弱，在面对，手臂，腿部(通常只在身体的一侧)，意识混乱，严重头痛，视力下降，头晕等。
Usually restless legs syndrome behaved serious in the rest and disappeared after activity. It much occur during the nocturnal sleep at middle age people.
症状与体征分离，安静状态下表现严重，活动后反而消失，多发生在夜间睡眠时。
Usually restless legs syndrome behaved serious in the rest and disappeared after activity. It much occur during the nocturnal sleep at middle age people.
症状与体征分离，安静状态下表现严重，活动后反而消失，多发生在夜间睡眠时。
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