potholing

They often go potholing on Huashan.

他们常在华山探索洞穴.

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Cave exploration, or potholing, as it has come to be known, is a relatively new sport.

洞穴勘察—或者洞穴勘探(人们已经熟悉了这个词语)—是一项较新的运动.

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