We had to wait until the engine had cooled down before restarting the car.我们必须等到引擎冷却以后才能重新发动车子。If the engine overheats, switch it off and do not start it again until it has cooled down.如果引擎过热,关掉它,等它冷却后再重新发动。I tried to start the engine again,but it was no-go.我试图重新发动,但总是白搭。The tractor won't restart.这台拖拉机无法重新发动。