Traditional mechanical lever weighing methods can cause a mechanical error, thus decrease the speed and precision.
传统机械杠杆的称重方法造成较大的机械误差，影响称量的速度和精度。
2
Force by promoting the advantage of increasing the speed of the object, the moving objects are closer than a lever to move the second distance.
优点在于增加施力所推动物体的速度，所移动物体的距离较第二类杠杆所移动的距离远。
3
The system operates by a lever (28) which controls a pitch control unit (10) which in turn controls engine speed and also the pitch of propeller blades (12) of propeller (14).