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Getting to that top bunk demanded agility; it was reached by a very vertical, very narrow ladder.
爬到上面铺位需要身手敏捷，有一架狭窄的垂直梯子。
Michael tells his brother that he found their access to the infirmary building, but he'll need extra time to find out how they'll get up a twenty foot vertical drain pipe without a ladder.
Michael告诉他哥哥，他找到了通往医务室大楼的路径，但他需要想个办法出来，能够不用梯子就爬上20英尺高的垂直排水管。
To compensate, they plan to install a submarine periscope at the top of the vertical steel ladder leading to the original access hatch.
作为补偿，他们打算在竖直的钢梯顶部安置一个潜水艇的潜望镜，这个钢梯是通往原先过道出口的。
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