agint.用以对他人的话作出反应或表示气愤adj.农业的；农业课题的pref.ad-的变体abbr.安提瓜及巴布达(拉丁美洲岛国)=(Antigua and Barbuda)Ag.abbr.元素银的符号Aguados阿瓜多斯

1. Indexing of key words is required by sci-tech research papers.
   摘要标引关键词是科技论文的基本要求。
2. Norminalization is applied extensively in various written genres of English, especially in English scientific papers.
   名词化广泛存在于各类语篇，科技论文是使用名词化频率很高的语篇类型。