你身体的不同部位是由不同种类的细胞组成的。
Different parts of you are made of different kinds of cells.
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肌肉组织就是由这些不同种类的氨基酸通过同化作用组成的。
Remember, muscle tissue is made from the assimilation of various amino acids.
表皮是由几种不同种类的细胞的单层所组成的。
The epidermis consists of a single cells.
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