It also called involuntarymuscle or skeletal muscle.
它又称为随意肌或骨骼肌。
2
Smooth muscle can not be controlled by the will, it is also called involuntarymuscle.
平滑肌不能由意志控制,所以又称为不随意肌。
3
Now it’s this latter muscle that’s involuntary, so the crows feet smile is considered the real spontaneous emotion and is known now as the Duchenne smile.