1. - * pg_catalog.english_stem is the subdictionary (here, a Snowball English stemmer) to use for thesaurus normalization.
   english_stem 是用于知识词典规范化的子词典（这里我们用了一个 Snowball 英语词干）。
2. - Specific stop words recognized by the subdictionary cannot be specified;
   For example, assuming that a and the are stop words according to the subdictionary: + 被子词典识别的特定的屏蔽词是不能声明的；

声明：以上例句、词性分类均由互联网资源自动生成，未经过人工审核，其表达内容亦不代表本软件的观点；若发现问题，欢迎向我们指正。