并列结构中,or通常用于否定句,and用于肯定句.There is no air or water in the moon.月球上没有水或空气.There is no air and water on the moon.月球上没有水也没有空气.She is not beautiful and clever.她漂亮但不聪明.She is not beautiful or clever.她不聪明也不漂亮.这个要怎么理解,把我搞糊涂了.

并列结构中,or通常用于否定句,and用于肯定句.
There is no air or water in the moon.
月球上没有水或空气.
There is no air and water on the moon.
月球上没有水也没有空气.
She is not beautiful and clever.
她漂亮但不聪明.
She is not beautiful or clever.
她不聪明也不漂亮.
这个要怎么理解,把我搞糊涂了.