麻烦解释两个短语 1)正中要害（说到主要的东西上了）.2)we use\"loving you long time不要爱得轰轰烈烈，要天长地久
关于ain't ain't：[eint](=are not，am not)“Ain’t”has a long and vital history as a substitute for“isn’t，”“aren’t”and so on.It was originally formed from a contraction of“am not”and is stillcom。
i have sth to do，或者my english is poor这样的语句是中国英语吗
