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.這種謹慎是必要的，因爲洞穴勘探家將要麪臨的睏難的性質， 是不可能預見的。potholer更多例句