When viewed from a microscope, there is no striation presented in the muscle, and moreover, since it is no controlled by our willpower, it is called involuntary, nonstriated muscle.
镜下观察，平滑肌无横纹状结构，平滑肌不随人的意志收缩，故称不随意肌非横纹肌。
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的;When viewed from a microscope, there is no striation presented in the muscle, and moreover, since it is no controlled by our willpower, it is called involuntary, nonstriated muscle.
镜下观察，平滑肌无横纹状结构，平滑肌不随人的意志收缩，故称不随意肌非横纹肌。
He gave an involuntary smile.
他不由自主地笑了一下。
Meg gave an involuntary exclamation.
梅格不由自主地叫了起来。
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