It also called involuntary muscle or skeletal muscle.

它又称为随意肌或骨骼肌。

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Smooth muscle can not be controlled by the will, it is also called involuntary muscle.

平滑肌不能由意志控制，所以又称为不随意肌。

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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.

现在发现眼轮匝肌的动作是无意识做出的，因此，带鱼尾纹的微笑被看成是情感的自然流露，誉为杜乡式微笑（发自内心的微笑）。

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Lethal electric fences, however, use a continuous current that can make a person lock on to the wire as voltage causes involuntary muscle contractions, paralysis and death.

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In the Alabama case, a consumer took Reglan and developed tardive dyskinesia, which causes incurable and involuntary muscle movements, and accused Wyeth, which is now owned by Pfizer, of failing to warn of the risk of long-term use.

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People who regularly get writer's cramp may be suffering from dystonia, a definition applied to a wide variety of conditions in which people suffer involuntary and often painful sustained muscle spasms.

BBC: writing