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。

Traditional mechanical lever weighing methods can cause a mechanical error, thus decrease the speed and precision.

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机械装置一个简单装置，如杠杆、滑轮或斜面刨，可以改变作用力的大小或方向或同时改变；简单机械装置。

A simple device, such as a lever, a pulley, or an inclined plane, that alters the magnitude or direction, or both, of an applied force; a simple machine.

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杠杆和滑轮是简单机械。

Levers and pulleys are simple machines.

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