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1. | It can take as long as eight days to rig up rope ladders and to establish supply bases before a descent |
| 在进入一个很深的岩洞之前,光是装配绳梯和建立供应基地就需要八天之久。(make a descent 下降) |
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2. | before a descent can be made into a very deep cave. |
| 然后才能到一个很深的洞穴里。 |
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3. | It was not long before seeds of descent took root. |
| 没过多久,反抗的种子开始生根。 |
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