注意，在物理学里面，势可以加上或者减去一个常数。

Remember, in physics, the potential is defined up to adding or subtracting a constant.

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最大值加上或者减去最小值只产生极小的差异。

The maximum plus or minus the minimum makes minute difference.

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这项技术使用电脑程序来追踪和计算粒子移动的快慢，然后每一分精确的加上或者减去20，得出NPR。

This technique uses a computer program that tracks and calculates how fast particles move, and is accurate to plus or minus 20 per cent, reports NPR.

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