1. 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（人们已经熟悉了这个词语）―是一项较新的运动。

2. Cave exploration, or pot-holing, as it has come to be known, is a relatively new sport.
    洞穴勘查--或洞穴勘探--是一项比较新的体育活动。

3. In this part of the cave, they could hear an insistent booming sound .
    在洞穴的这块地方，他们能够听到持续的轰响.

4. I am sure that, without modern weapons, I would make a very poor show of disputing the ownership of a cave with a bear,
    我断定，如果没有现代化的武器，要我和一只熊去争洞穴，我会出洋相的；

5. It can take as long as eight days to rig up rope ladders and to establish supply bases before a descent can be made into a very deep cave.
    有时需要花费整整8天时间来搭起绳梯，建立供应基地，然后才能到一个很深的洞穴里。

6. In this part of the cave, they could hear an insistent booming sound
    在这儿，他们可以听见一种连续不断的轰鸣声。

7. Which they found was caused by a small waterspout shooting down into a pool from the roof of the cave.
    后来他们发现这是由山洞顶部的一个小孔里喷出的水柱跌落到水潭中发出的声音。