形容词
中文翻译：Unknown
同义词：
['contractile', 'contracting', 'contractable']
例句：
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1. The muscle is contracting as it gets stronger.
肌肉在变得更强壮时正在收缩。
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2. The heart's contractions are responsible for pumping blood throughout the body.
心脏的收缩负责将血液泵送到全身。
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3. The muscles in the human body are contractile and can be controlled by the nervous system.
人体的肌肉是有收缩能力的，并且可以通过神经系统来控制。