然而深层隧道地铁不容易指望了：空间过于狭小无法排放废气，这就没法使用传统空调。

But the deeper lines are trickier: space is so tight that there is nowhere for waste heat to go, which makes traditional air-conditioning impossible.

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采用动力有限元数值分析方法，提出估算地铁隧道地震响应永久变形的有限元计算模型。

Dynamic finite element method was presented for evaluating seismically-induced permanent deformation of subway tunnel.

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Sometime it will just stop in the middle of a tunnel for however long.

有时候，地铁会久久地停在隧道的中间。

纽约的交通手段 - SpeakingMax英语口语达人