湖上居民必须登梯才能进入他们的屋子。
The lake dwellers had to climb ladders to get into their houses.
他登梯爬上屋顶。
二人此刻刚好处在通往德农厅的隧道的一半的路程上。兰登看到了尽头的一对向上的扶手电梯，但两个扶手梯都一动不动。
The two men were now halfway up the Denon Wing's entry tunnel, and Langdon could see the twin ascending escalators at the far end, both motionless.
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