词干推导根据语法变化得出词汇表中已有单词的派生形式，包括动词的变化，比如write、wrote和written，或名词形式，比如mouse和mice。

Stem derivation finds derived forms of in-vocabulary words based on grammatical inflection, including verb conjugations such as write, wrote, and written, or noun forms such as mouse and mice.

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