人血清可用于需要天然培养基的细胞培养。
The Human serum is often used in the cell culture essential for natural culture medium.
城市是人类文化的载体，也是文学天然的培养基。
Cities are the carrier of human culture and a natural culture medium of literature.
城市是人类文化的载体，也是文学天然的培养基。
Cities are the carrier of human culture and a natural culture medium of literature.
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