... reproduction of animals 动物的繁殖 reproductin of human beings 人类的繁殖 the structure and functions of a flower 花的结构和功能 ...
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对于这一事件没有确定的解释，但推测人类的繁殖与温度和季节有密切关系。
No firm explanation has been put forward for this, but speculation is that human reproduction is linked to temperature and season.
她指出，人类一直试图加强配偶之间的联系，最大限度地提高繁殖成功率。
She suggests that humans have always tried to strengthen the pair bond to maximise reproductive success.
有人认为，如果环境能够支持熊的繁殖，那么就有足够的食物资源来支持人类。
It has been suggested that if the environment were capable of supporting breeding populations of bears, there would have been enough food resources to support humans.
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