高中英语The number of the students in senior high school,( )is m

as 还有“正如,正像”之意,表示说话人的依据、态度、评论和看法,常用在以下结构中：as we all know,as you can see/here/watch/remember/expect.as is often reported,as is known to us all,as has been said before,as often happens等.
as引导的非限制性定语从句课谓语主句前或后,也可在句中.
当先行词前有so/such时,如果关系代词在从句中作主语或宾语,那么只能用as.
例如：It is such a beautiful school as I have never seen before.
很高兴为你解答!
多谢你的问题!