We go out onto the trestles and step carefully from frame to frame to get to the crossover to the far tunnel.
我们上到支架上，每一步都很小心，从一个架子到另一个架子穿越这个空间到远一点的隧道。
We go out onto the trestles and step carefully from frame to frame to get to the crossover to the far tunnel.
我们上到支架上，每一步都很小心，从一个架子到另一个架子穿越这个空间到远一点的隧道。
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