The truth that at any minute, you might bring a freight train through the wall.

真相就是随时随刻，你都有可能从墙里拽出一辆货运列车；

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This paper addresses the problem of direct freight train service.

本文对装车地直达列车开行方案问题进行了研究。

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This paper addresses the problem of direct freight train service.

本文对装车地直达列车开行方案问题进行了研究。

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