英语问题50-cents-off
问题描述：
英语问题50-cents-off
A psychologist has run a series of tests which reveal people will give away some of their important personal information just to get their hands on a pitiful 50－cents－off coupon.这句话中的50-cents off是什么语法?还是固定搭配?
答
是一种构词法,就像20-year-old girl/boy一样,作为一个形容词修饰后面的名词