A sudden， involuntary contraction of a muscle or group of muscles.
痉挛肌肉或肌肉群突然的，不自觉的收缩。
Spasmodic winking caused by the involuntary contraction of an eyelid muscle.
脸痉挛由于眼睑肌肉偶然挛缩而引起的痉挛性眨眼。
Your GI tract is an involuntary muscle which is constantly contracting and expanding.
你的胃肠道是一组非随意肌，它会不停的收缩扩张。
cardiac and smooth muscle from the control of selfdetermination, Guer called involuntary muscle.
心肌和平滑肌不受自我意志的控制，故而又叫不随意肌。
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