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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When gasoline burns, nothing visible remains.

汽油燃烧时，能看见的东西都化为灰烬。

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But he fared just as the first one, he gazed and gazed, but as, apart from the empty loom, there was nothing visible, he could not see anything else.

但是他跟第一位的遭遇一样，他看呀看，但是呀，除了空空的纺织机，没有其它的东西，他什么也看不到。

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Engineers determined there was nothing to lose by installing a new pump, despite the lack of visible damage to the old one.

WSJ: Spacewalkers Replace Space Station Pump

There is nothing that drives a team like the fear of debt, starvation, and visible failure.

FORBES: Should Startup Founders Keep Their Day Job?

Nothing on the phone exuded cheapness, and we couldn't find any visible flaws in the hardware or software performance.

ENGADGET: Pantech Discover hands-on (video) Mobile