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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 can be made into a very deep cave. |
| (make a descent 下降) |
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2. | make a descent upon |
| 侵入,袭击 |
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3. | The dane make numerous descent upon the english coast during the 10th century |
| 丹麦人在十世纪曾对英国海岸发动过无数次袭击 |
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