adj.介词的,前置词的;
例句:
A preposition together with its object is called a prepositional phrase.
介词与它的宾语一起称为介词宾语.
What is the function of the prepositional phrase?
这个介词短语的作用是什么?
The prepositional phrase used as an adverbial is usually before a verb.
介词结构一般放在动词前作状语.