例如，一种新的系统允许联合收割机向牵引拖车发送呼叫，以便司机可以在必要的时候卸载谷物。

A new system allows a combine harvester, say, to send a call over to a tractor-trailer so the driver can unload the grain as and when necessary.

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上月晚些时候，一帮窃贼偷走了6牵引拖车的土豆和一满卡车来自佛罗里达种植户的黄瓜。

Late last month, a gang of thieves stole six tractor-trailer loads of tomatoes and a truck full of cucumbers from Florida growers.

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在拖车运行时必须谨慎地操纵控制系统，否则牵引机就会被推倒。

Great care had to be taken with the control systems for a powered trailer because, when turning, it can push the tractor unit over.

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