名词
中文翻译：收缩
同义词：
['tightening', 'constriction']
例句：
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1. Themuscles in his arms are contracting ashe exercises.
他的手臂肌肉在锻炼时正在收缩。
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2. The wound is starting to contract, which can be painful.
伤口开始收缩，这可能会很痛。
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3. Thetightrope walkermust be careful not to contractthe muscles too much.
走钢丝的人必须小心不要过度收缩肌肉。