n.洞穴探險(xiǎn)；洞穴探險(xiǎn)運(yùn)動(dòng)
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(人們已經(jīng)熟悉了這個(gè)詞語)－是一項(xiàng)較新的運(yùn)動(dòng)。
