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

通常，全相加的测度是最理想的。

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A value that can be added across all dimensions is considered to be fully additive.

将可以跨所有维度相加的值视作全相加的。

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

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）。

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"For the hardcore fans that have played the games, read the books, read the comics, have the consumer products, and are fully intending to dive into 'Halo 4, ' this is very much an additive experience, " Feldman said.

CNN: Web series builds anticipation for 'Halo 4'