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。
He discovered that myosin is only needed for the first and final stages of the amoeba's development and that, in all stages between, myosin is like a candy bar after lunch — nice but not needed.
他发现，阿米巴虫只在发育的最初和最后阶段需要肌凝蛋白，而在所有的生长阶段之间，肌凝蛋白就如同午饭之后的糖果棒——美味但并不是必需的。
One that churns out actin and myosin, which link up to form units that can expand and contract, will become a muscle cell. And so on.
而那种大量炮制肌动蛋白和肌凝蛋白的细胞，连接在一起从而形成可扩展及缩小的单元，这种细胞将成为肌肉细胞。如此类推。
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