基本解释探坑[洞]的人 -ling同根派生 potholer相关词英汉例句Precautions of this sort are necessary, for it is impossible to foretell the exact nature of the difficulties which will confront the potholer.这种谨慎是必要的，因为洞穴勘探家将要面临的困难的性质， 是不可能预见的。potholer更多例句