如何提高心肺功能通过有氧运动。有氧运动指由于人体在一段持续时间内进行的身体活动而使身体对氧气需求量增加的一种状态。

Aerobic exercise, a method of conditioning the cardiorespiratory system by using a variety of activities that create an increased demand of oxygen over an extended period of life.

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当一段联系持续时间足够长，使两个人通过一组相对稳定的预期连结在一起，这就叫做关系。

When an association continues long enough for two people to become linked together by a relatively stable set of expectations, it is called a relationship.

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相反，观众可以有一段具体的时间来欣赏话剧或者戏剧，这段时间就是表演的持续时间。

By contrast, the audience encounters an opera or a play over a specific time, which is the duration of the performance.

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So, over the course of time this could have a very substantial impact on the community.

所以,这种病毒在一段时间内,会对当地社会产生持续的影响

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but over an extended period of time.

而是持续一段时间的事情。

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Well, the first thing that I noticed, they have been going wrong for a while.

据我观察，首先，这种状态其实已经持续了一段时间了。

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