我看新概念英语时遇到了两个搭配,百思不得其解,求解惑。be referred to as 'white-collar workers'.be regarded as unsinkable.既然介词后面只能接名词,代词,名词性从句,那么这两个是什么情况,1中介词后面接介词,2中介词后面接形容词,困惑啊困惑。