你必须在岩石上打钻，而那些岩石比你通常在油田遇到的要硬得多。

You have to drill into rocks much harder than those you normally encounter in oil fields.

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要做到这一点，你必须在岩石上打钻，而那些岩石比你通常在油田遇到的要硬的多。

To do that, you have to drill into rocks much harder than those you normally encounter in oil fields.

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经过几年对锚杆钻机的跟踪研究，发现锚杆钻机在围岩作业中常遇到软岩中有硬岩夹层的现象，造成施工过程经常更换钻具的问题。

After several years to jumbolter research, the hard rocks always present in the soft ones in the wall rock procedure using jumbolter, which results in changing the boring tool during the procedure.

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