A sperm cell develops from a sperm mother cell.
精细胞从精母细胞发育而成.
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How can an X chromosome be nearly as big as the head of the sperm cell?
染色体怎么会接近性子头部的大小?
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The vaccine works by blocking male sperm cell from joining female egg cell.
疫苗阻断雄鼠精细胞同雌鼠卵细胞结合.
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