Male reproductive cells travel down the tube and join with the ovule, fertilizing it.
Male reproductive cells travel down the tube and join with the ovule, fertilizing it.
雄性生殖细胞到达花柱然后加入卵子，使它授精。
Male reproductive cells travel down the tube and join with the ovule, fertilizing it.
雄性生殖细胞到达花柱然后加入卵子，使它授精。