The President of the United States serves a term of four years.这里a term of为什么是of而不是for?

题目

The President of the United States serves a term of four years.这里a term of为什么是of而不是for?

答案

a term of 固定搭配啊,四年的任期.a term of four years整体做时间状语.用for的话应该这样的：The President of the United States serves the country for 4 years