A sperm cell develops from a sperm mother cell. 精細胞從精母細胞發(fā)育而成。
After it reaches its maturity,the whole volume of the oil cell is filled with the large vacuole,which becomes the oil sac subsequently. 當油細胞發(fā)育成熟后，細胞質(zhì)及核開(kāi)始解體，整個(gè)油細胞的腔由大液泡充滿(mǎn)，成為油囊。
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