Ject对"potholer" 的正确翻译：探坑[洞]的人 -ling。例句参考：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。；