通常，全相加的测度是最理想的。

Generally, it is desirable for measures to be fully additive.

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当测度不是全相加的时，应考虑将它们分成其原子元素。

When they are not, you should consider breaking them down into their atomic elements.

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相加性（要总结的测度的能力）：测度分成三个类别：全相加的（fully additive）、非相加的（nonadditive）和半相加的（semiadditive）。

Additivity (the ability of measures to be summarized): Measures fall into three categories: fully additive, nonadditive, and semiadditive.

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