The students are qualifying themselves for teaching. 学生们正为从事教育事业而学习提高。
A qualifying or amplifying word, phrase, or sentence inserted within written matter in such a way as to be independent of the surrounding grammatical structure. 插入成份,插入词在书写中插入的与上下文的语法结构没有关系的限定或补充的词、短语或句子