1）按照词形是否变化： 词 变化词(variable words) 非变化词(invariable words) 动词，名词，形容词等 介词，连词，部分副词等 3.
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Variable and invariable words 可变词和不变词
In other words, this variable does not rise to the level of adding useful information in the presence of the other variables.
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