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1·And then starting to turn the crank on the algebra.

然后开始代数变换。

2·The fifth is starting system and its purpose is to change the electrical current into the mechanical energy to push the crank-shaft around. By means of this, the engine can be started.

发动机的第五系统是启动系统，其目的是将电流转化成机械能来推动曲轴旋转，通过这一点，发动机可以启动。

3·Without them our mobile devices would be a lot less mobile and we might still be crank starting our cars.

没有他们的移动设备将是手机少很多，我们可能仍然是我们的汽车曲轴开始。

4·The fifth is starting system and its purpose is to change the electrical current into the mechanical energy to push the crank-shaft around. by means of this, the engine can be started.

发动机的第四个系统是起动系统，起动系统的作用是把电能转变为机械能推动曲轴转动。

5·The motion relationships of the crust and the core of the earth are shown by starting the motor or rotating the hand crank.

通过启动电机或转动手摇， 可反映到地壳和地核的运动关系。