They learned to rappel down a cliff.
他们学会了绕绳从绝壁上滑下。
The curriculum includes a lesson from the firemen on how to rappel from a building.
其中的课程包括消防员教授如何用绳索从大楼上下来。
So now I don't want to rappel down on the back side of this slip knot, that would be dangerous.
好现在我不要在这个可以拽开的结的这一段下降,太危险了。
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