它指明了粒子有一个有量子机械作用而决定的能量最低值，我们将其称作为零点能。
It is the point at which particles have a minimum energy, determined by quantum mechanical effects, which is called the zero-point energy.
它具有机构简单、变量准确、能够过零点操作以及响应速度快的特点，适用于运输车辆及工程机械等场合。
It features simple and accurate displacement variation, ability in cross-zero operation and fast response and is suitable for transportation vehicles and construction machinery applications.
在应用机械能守恒定律时，如何巧选弹簧弹性势能零点问题进行了探讨，并结合实例进行了分析。
This paper deals with the problem of how to skilfully select spring elastic potential energy zero in applying law of conservation of mechanical energy, and makes some analyses combined with examples.
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