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

结构,平滑肌不随人的意志收缩,
称不随意肌非
肌。
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(汇总)
60秒-科
美国
2019
8
合集
新
特辑
生英语 2019
2
合集
习篇
霸养成计划
2
合集
8
合集
小课堂 And sometimes things happen to you that may seem horrible, painful and unfair at first, but in reflection you find that without overcoming those obstacles you would have never realized your potential, strength, willpower or heart.
有时候,发生在你身上的事情看似可怕、痛苦和不公平,但仔细一想,你就会发现,如果不克服这些障碍,你就不会意
到自己的潜能、力量、意志和决心。
12
合集
六级听力真题精听