名词
中文翻译：内部收缩
同义词：
['internal compression', 'internal tension']
例句：
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1. Themuscle is undergoing an internal contractionas it relaxes.
肌肉在放松时正在经历内部收缩。
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2. During the growth process, plants experience internal contractions that helpthem grow larger.
在生长过程中，植物会经历内部收缩，这有助于它们长得更大。
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3. The scientist observed the internal contractions of the heart during atrialfibrillation.
科学家观察到心房颤动期间心脏的内部收缩。