I don't know. 如果你是新手的话,你就这样记,汉语发音近似(AI 懂了 );
礼貌一点 应该用, Sorry , I don't know. I am afraid I know nothing about it.
也可以用 I have no idea about it. It is not clear for me.
另补充一些各种情况表达 不知道的说法
不知情 :I am out the loop of sth... 如 I am out the loop of this project.
超出能力范围; It is beyond me. It's over my head.
困惑: I am at a loss. I am confused. I don't get it . I can't understand that , I cannot catch you.
I cannot follow you. I cannot see your point. I am not sure what you mean.
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