This is an air ticket from Beijing to Shanghai.

问题描述:

This is an air ticket from Beijing to Shanghai.
这句话from Beijing to Shanghai.是 1.介词短语 做定语呢?
还是2.一个定语从句省略了引导词..

from Beijing to Shanghai本身可以看作是一个定语来使用.
而看作一个定语从句;
要还原为:This is an air ticket [which is] from Beijing to Shanghai.
虽然也说的通,但表述起来太麻烦.