这些结构在早些年曾被回声探测器探测到，但是它们从未被钻探过。

These structures had been detected years earlier by echo-sounding instruments, but they had never been penetrated in the course of drilling.

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在他看来，尽管采用这种方法得出的岩石结构分析结果能够告知人们哪个钻探点不可能产生商业回报。

Though analysis of a rock's structure in this way will, in his opinion, be able to tell you that a strike is unlikely to yield a commercial return.

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这种钻头必须足够轻、结构紧凑同时有足够动力在月球表面钻探。

The drill had to be lightweight, compact and powerful enough to dig deep into the surface of the moon.

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