If they carry on sinking boreholes then the land is likely to subside.如果他们继续钻洞，地表很有可能下沉。The correctness of the result was proved by some underground boreholes.经过少量的井下钻孔验证,证实了结果的正确性.This paper describes the substance a th...

n.地上凿洞( borehole的名词复数 )...

boreholes的音标：...