It is impossible to give a satisfactory explanation for a pot - holer ' s motives 要想对洞穴探险者的动机作出满意的解释是不可能的。
2.
The cave might never have been discovered has not the entrance been spotted by the distinguished french pot - holer , berger 若不是法国著名洞穴探险家伯杰由于偶然的机会发现了这个洞口的话，这个洞也许不会为人所知。
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