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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拖车将被分成俩部分，在两个侧面连接到底座上，在任一原动机的牵引下进行移动。

Trailer will be in two parts and will be connected on two sides of the car body and will be moved with help of any prime mover.

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带拖车的轮式移动机器人系统由一节牵引车拖挂若干节拖车构成，其运动轨迹具有单车体机器人无法比拟的复杂性。

Tractor trailer wheeled mobile robot system is composed of a tractor and multiple trailers, its motion trajectories are much more complex than that for single body robot.

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