Sorry,I don't understand . 这是什么意思?

sorry,i don't understand
1.对不起,我听不明白sorry,i don't understand
1.不,我不懂
2.对不起,我不懂i'm afraid(sorry) i don't understand you
1.对不起我不懂你的话i'm sorry,i don't understand what you just said
1.抱歉,我不懂你说什么sorry,i don't understand,could you pls slow down
1.对不起我说英语很差的,你可以慢点说吗