学霸之间的对话
清清:Do you understand that that?
佳佳:Which that?This that?
清清:No,it isn't.It's that that that appears on that page
佳佳:Oh,it's so hard to understand that that that that that is only understood by that teacher that learns English well.
QUESTION:How many people understand that that?
(PS:这里说的人只是在文中的人)
答案：
解析：
