He gave an involuntary smile.
他不由自笑了一。
Meg gave an involuntary exclamation.
梅格不由自了起。
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.
从纤观察,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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