复数： reproductions

This implies an important role in reproduction in all mammals .

这说明所有哺乳动物中这一因子在繁殖中的重要角色。

However , artificial reproduction using sperm donation is allowed .

不过，在日本可使用捐赠的精子进行人工生殖。

From recorded time , man has been fascinated with music and the hardware of sound reproduction .

有史记载以来，人类一直痴迷于音乐，痴迷于复制音乐的音响设备。

For example , sex evolved for reproduction .

例如，性因繁殖才演化而来。

This helps the few cells specialised for reproduction to do so more effectively .

这可以帮助专门进行繁殖的少数细胞更有效地繁殖。