The ovum develops only in the female, and the sperm cell develops only in the male.
The ovum develops only in the female, and the sperm cell develops only in the male.
卵细胞仅在女性体内产生，而精子细胞则仅在男性体内制造。
The ovum develops only in the female, and the sperm cell develops only in the male.
卵细胞仅在女性体内产生，而精子细胞则仅在男性体内制造。