How do archaeologists know where to find what they are looking for when there is nothing visible on the surface of the ground?

地面上什么也看不见，考古学家怎么知道到哪里去找他们要找的东西呢？

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I was born on the plains where the wind blows free, and there is nothing to break the light of the sun.

VOA: special.2010.04.01

There's a lag period where if I was just looking for antibodies nothing happens for a while.

这中间存在一段迟滞期,如果只过一会就进行观察,抗体的数量不会发生变化

耶鲁公开课 - 生物医学工程探索课程节选

so that no matter where you're sitting there's nothing that obstructs your view.

所以，无论你坐在哪里，没有什么会挡住你的视野。

精彩音乐会 - SpeakingMax英语口语达人

As we demonstrated in the graphs above, there are many cases where common is worth nothing and preferred is worth a lot, but there are no cases where common is worth a lot and preferred is worth nothing.

FORBES: Why Your Equity Could be Worth Less Than You Think (Or Possibly Nothing at All)

Chair of the trust Eve Tigwell said each site had to be assessed as there was no point putting up a box where "there's nothing for them to feed on".

BBC: Barn owl at a farm

We did a lot of different things and saw a lot of different doctors to see that there was nothing where I could hurt myself.

WSJ: Devils G Brodeur practices after missing 12 games