1. And by measuring the time interval between the taps and the receipt of the echoes, the depth of the sea at that point can be calculated.
    测出回声间隔的时间，便可算出该处海洋的深度。

2. Despite their short time on Earth, however, people have brought about enormous changes to the surface of the planet — changes far out of proportion to the interval of time they have occupied it.
    然而，尽管在地球上的时日尚短，人类却已给地球表面带来了巨大的变化——这些变化与人类占据地球的短暂时间相比，是远远不成比例的。

3. Some unknown interval of time passes before her eyes open again, only this time there is no response in them, just a blank stare.
    不知过了多长时间，她又睁开了双眼，只是这一次目光里没有任何反应，只有空空的凝视。

4. Unfortunately, there is frequently a great interval between knowing how to solve a problem and finding the resources to solve it.
    不幸的是，从知道怎样解决问题到准备充足的人力物力去解决它，两者之间还有很大的差距。