In the early days of cars, you actually had to crank the engine with a little handle. Now the crankingmotor or starter is just powerful enough to start the engine turning.
以前的汽车需使摇柄才能使发动机启动，现在启动机或点火机已足以使发动机启动了。
2
A battery provides the electric power to operate the starting motor and the ignition system during cranking.
在启动时，蓄电池提供电能能使启动电机和点火系运转。
3
When the ignition key is turned against spring pressure past the on position to start, the starting contacts close. This connects the cranking-motor solenoid or magnetic switch to the Battery.