He gave an involuntary smile.
他不由自主
笑
一下。
识做出
;非故

词: involuntarily
, 志愿
;
, 无
识
;
;
;
;
;
;
,无心
,无
识
;
;He gave an involuntary smile.
他不由自主
笑
一下。
Meg gave an involuntary exclamation.
梅格不由自主

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
志收缩,故称不随
肌非横纹肌。
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