Task: Translation
Input (English): The incident began when two vehicles blocked the transmission truck, labelled 'TV', and their bodyguard was forced to the ground at gunpoint by a masked man.
Output (Chinese): 事件起因是两辆车挡住了标有“TV”字样的传输卡车，他们的保镖被一名蒙面男子用枪逼倒在地。