side dump tractor trailer unit 牵引拖车侧卸设备
The dynamic loads of engine in tractor-trailer unit are classified into four kinds with frequency structure.
拖拉机挂车机组工作时的动态载荷按其频率结构可分成四类。
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。
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