Don't make presumptuous comments out of ignorance. Don't make improper comments before you know the whole story.
不要不明原委， 就妄加评论。
AIDS in Africa has a high incidence of a variety of reasons, I can not make improper comments.
艾滋病在非洲高发有着种种原因，我在此不能妄加评论。
My answer is: I know nothing about my previous life, so I dare not make improper comments on afterlife.
我的回答是：我不知道前生，因而也不敢妄谈后世。
应用推荐