如果说一组列车脱轨了，就是指该组列车脱离了火车行驶轨道。

If a train derails or is derailed, it comes off the railway tracks.

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火车沿着轨道嘎嚓嘎嚓地缓慢行驶着。

The train chugs down the track.

《柯林斯英汉双解大词典》

但是，反过来说，大多数帆船都配有马达，以便在港口内行驶，弗里德曼博士这样描述在地球轨道的情况。

But then again, most sailboats do have a motor for tooling around in the harbor, which is how Dr. Friedman describes being in Earth orbit.

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