He gave an involuntary smile.
他不由
笑了一下。
词: involuntarily
词: involuntariness
愿的, 志愿的;发的, 无意识的;
;;
的;He gave an involuntary smile.
他不由笑了一下。
Meg gave an involuntary exclamation.
梅格不由叫了起来。
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，平滑肌不随人的意志收缩，故称不随意肌非横纹肌。
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