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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·This crisis might last for a long period of time.

此次危机可能会持续很长一段时间。《柯林斯英汉双解大词典》

3·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》

4·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。

5·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。

6·In fact, there is another type of friend—one that has not been with us for a long period of time, but fills our mind at some moment.

事实上，还有另一种朋友，他虽然很长一段时间没有和我们在一起，但却会在某个时刻充满我们的心灵。

7·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。

8·The manager and the businessman talked for a long period of time, but when he was asked for advice, the businessman stopped for a while and then said, I have no advice to give.

经理和商人谈了很长一段时间，但当商人被问及建议时，他停顿了一会儿，然后说：“我没有什么建议可以给你。”

9·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。

10·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。