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。
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。
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。
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。
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。
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。
Trackers, which are ongoing projects that look at trends or customer satisfaction over a long period of time.
一个正在进行的项目——“追踪者”，在研究很长一段时期内的趋势或客户满意度。
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。
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。
For a long period of time and in many parts of the country, a traveler was a welcome break in an otherwise dull existence.
很长一段时间，在美国的许多地方，旅行者是一种受欢迎的打破沉闷生活的方式。
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。
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。
By dropping out after studying for a period of time, the two students have wasted educational resources, which could have been provided for others.
两名学生学习一段时间后辍学，他们浪费了本可以提供给其他人的教育资源。
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。
In such studies, researchers would need to follow groups of children with and without music lessons over a long period of time—even if the assignments are not completely random.
在此类研究中，研究人员需要在很长一段时间内对上音乐课和未上音乐课的不同小组的儿童进行追踪——即使任务并不是完全随机的。
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。”
In such a life history strategy, the organism suspends any growth, reproduction, or other activities for a period of time so that they may occur at a later, more hospitable time.
在这样的生命史策略中，有机体暂停任何生长、繁殖或其他活动一段时间，以便它们可能在更晚、更适宜生存的时间发生。
The empty shell of a snail or clam may be left behind, and if it is sufficiently durable and resistant to dissolution, it may remain basically unchanged for a long period of time.
蜗牛或蛤蜊的空壳可能会被留下来，如果足够持久和抗溶解，它可能会在很长一段时间内基本保持不变。
White said his team wanted to see whether living in greener urban areas had a lasting positive effect on people's sense of well-being or whether the effect also disappeared after a period of time.
怀特说，他的团队想知道生活在绿化较好的城市地区是否会对人们的幸福感产生持久的积极影响，还是说这种影响会在一段时间后就消失。
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