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.
在一些机械式制动系统中用来操纵制动器的拉索。仍用于拖车和大多数轿车的手制动器。
Wire cable used to operate the brakes in some mechanical brake systems, still used for trailers and for the handbrake on most cars.
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