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.
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.
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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