求翻译：In traditional methods, one of the major defects of stemming like Porter's [16] is that they often conflate words with similar syntax but completely different semantics. For example, “news” and “new” are both stemmed to “new” while they belong to two quite different categories. Moreover, words “USA” and “ADIS” after stemming they become “U” and “AD”, respectively, which have no meaning or relation to the original one at all in the sentences. This paper proposes the generic knowledge of expressions for solving this problem.是什么意思？

待解决 悬赏分：1 - 离问题结束还有