名词
中文翻译：收缩
同义词：
['shortening', 'constriction例句：1. The muscle contracted as the person lifted the weight.（当这个人举起重量时，肌肉收缩了。）']
例句：
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1. The muscle contracted as the person lifted the weight.
当这个人举起重量时，肌肉收缩了。
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2.The blood vessels in the skin contract toconserve heat.
皮肤中的血管收缩以保存热量。
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3. The heart's contractionsare essential for maintaining circulation.
心脏的收缩对于维持血液循环至关重要。