现在我要按下杠杆，机器就会启动。

Presently I am going to press the lever, and off the machine will go.

这个杠杆的力臂很长。

The lever has a long arm of force.

使用杠杆来抬起重物。

Use the lever to lift the heavy object.

这个杠杆的力矩很大。

The moment of this lever is very large.

他拉动杠杆启动机器。

He pulled the lever to start the machine.