求翻译：教练车起步时踩下离合器踏板，挂上一挡，打开左转向灯，按喇叭(驾校规定，实际行车时要注意是否是在禁鸣区)，释放手制动，观察后视镜和前方情况，抬起离合器踏板.同时缓慢踩下油门踏板，平稳起步。是什么意思？

Under coach when the car started stepping on the clutch pedal, hung up a gear, turn left turn signal, Horn (driving school provision, the actual road should pay attention to whether it is in the Ming ban area) to release the hand brake, observe the rear-view mirrors and the front, lift the clutch pedal. at the same time slow pushed down on the gas pedal, a smooth start.