He gave an involuntary smile.
他
由自主地笑了一下。
词
词
的;
是故意的,无心的,无意识的;受抑制的;He gave an involuntary smile.
他由自主地笑了一下。
Meg gave an involuntary exclamation.
由自主地叫了起来。
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.
从纤维镜下观察，平滑肌无横纹状结构，平滑肌随人的意志收缩，故称随意肌非横纹肌。
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