Let's suppose you put in four words to find the documents that contain a phrase, contain a word with a weight of 3.5, and do not contain the second word.
假设，需要放入第四个单词来查询包含了一个词组、一个权重为3.5的单词，但不包含第二个单词的文档。
Numeral abbreviation consists of four classes: word, phrase, sentence and text in terms of its original words.
从缩略的对象上看，数字缩略语的缩略可分为词、短语、句子和篇章四个层次；
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