求翻译：教练车学员在起步前，首先启动发动机。变挡杆挂入空挡，拉紧手制动，踩下离合器踏板，转动点火开关钥匙到启动位置，听到启动机启动的声音,即可启动发动机。发动机启动后，应立即放松钥匙.放松离合器踏板，观察仪表操作是否正常.是什么意思？

Coach students before the start, first start the engine. Retaining bar hanging in neutral gear, tightened the hand brake, step on the clutch pedal, turn the ignition switch key to starting position, heard started for the start of the sound, you can start the engine. After engine start, should immediately relax key. relax the clutch pedal, meter operation is normal.