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构成所有生物的基本单位叫细胞。它们很小,所以不使用显微镜就看不见。任何活组织生长的时候,它的细胞也在生长并分裂成新的
The basic unit that makes up all living things is the cell. They are small, so they can’t be seen without a microscope. When any living tissue grows, its cells also grow and split into new ones.