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
Now that you are a college student, you should learn to be independent of your parents' help.
既然你已是个大学生了，就应当学着独立，不靠父母的帮助。
You should learn to be independent of your parents.
