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1·All these changes happened over a period of time.

所有这些变化都是在一段时间内发生的。《牛津词典》

2·She spent a period of time working with people dying of cancer.

她用一段时间帮助即将死于癌症的人们。《柯林斯英汉双解大词典》

3·After a period of time, the blanket breaks and a wet, weak butterfly appears.

过了一段时间，覆盖层破裂，一只湿漉漉、虚弱的蝴蝶便出现了。

4·You will have a period of time to relax and then set out on your new journey.

你将有一段时间来放松，然后开始新旅程。

5·A foster mother is a mother who takes someone else's child into her family and cares for the child for a period of time just as what she would do to her own child.

养母是指把别人的孩子带到自己家里，像照顾自己的孩子一样照顾他一段时间的母亲。

6·After training for a period of time, the researchers tested the bees.

经过一段时间的训练后，研究人员对这些蜜蜂进行了测试。

7·Tribes would stop fighting for a period of time if they found a tree with mistletoe.

如果他们发现一棵树上有槲寄生，部落会停止一段时间的战斗。

8·It peaks in young adulthood, levels out for a period of time, and then generally starts to slowly decline as we age.

它在青年时期达到顶峰，在一段时间内趋于平稳，然后普遍会开始随着年龄的增长而缓慢下降。

9·When that separation lasts for a period of time, the two populations are able to evolve along different trajectories.

当这种分离持续一段时间后，这两个种群能够沿着不同的轨迹进化。

10·One advantage of pitfall traps is that they can be used to collect over a period of time with minimal maintenance and intervention.

陷阱的一个优点是可以在一段时间内用最少的维护和干预进行收集。