Even at this hour it was acrawl with men, builders pushing up a new switchback stair to join the remnants of the old.
即使
上面挤满了人，工匠正
新的梯子接到旧的上。
Z形路轨向原来的方向返驶,改变角度Even at this hour it was acrawl with men, builders pushing up a new switchback stair to join the remnants of the old.
即使上面挤满了人，工匠正新的梯子接到旧的上。
：
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问题，欢迎向我们指正。
