肌肉是由极多的彼此紧帖的纤维所组成的，它含有两种不同的物质：肌球蛋白和肌动球蛋白。
A muscle is a very large number of fibers close together, containing two different substances myosin and actomyosin.
肌肉是由极多的彼此紧帖的纤维所组成的，它含有两种不同的物质：肌球蛋白和肌动球蛋白。
A muscle is a very large number of fibers close together, containing two different substances myosin and actomyosin.
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