... concrete ledge，岩壁梁 generator floor，发电机层 turbine floor，水轮机层 ...
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suspended concrete ledge 岩壁牛腿
concrete ledge
具体的窗台
以上为机器翻译结果，长、整句建议使用 人工翻译 。
We trudged along a dusty shelf, up another metal ladder, and had to crouch to walk through a narrow tunnel, eventually emerging on a concrete ledge smeared with pigeon droppings.
BBC: Subterranean Sydney
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