It reduces the number of times oil RIGS need to be moved. When one well runs dry, another can be drilled in another direction (instead of moving to a new spot).

减少了石油井架的搬运次数。当一口井干了，可以朝另一个方向钻新井(而不用挪到一个新的地方)。

youdao

If the target slab is deemed suitable, a number of test holes are likely to be drilled - using the rotation as well the percussive action - before a powdered sample is picked up and delivered to Curiosity's onboard laboratories.

BBC: Curiosity Mars rover hammers into rock

Davy was drilled a number of years ago to only 20, 000 feet and abandoned as a non-producing well.

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