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？

youdao

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