英语高手请进Oftenmuseumscollectmoreobjectsthantheyhaveroomtodisplay.1.objects是和room做比较吧,那为什么不是moreobjectsthanroomtheyhavetodisplay.而是和theyhave.这句句子比较.2.todisplay在句中是什么

Question

英语高手请进
Often museums collect more objects than they have room to display.
1.objects 是和room 做比较吧,那为什么不是more objects than room they have to display.而是和they have.这句句子比较.
2.to display 在句中是什么成分,起什么作用?
补充问一句:they do not flash on your mental screen immediately before waking,as was previously believed .
as 他引导的是什么从句？
as 是否 可以改成 as it was previously believed.

Answer 1

可以看作是省略了一部分：
Often museums collect more objects than (objects that) they have room to display.