A year ago, 11 of his students earned scholarships to four-year colleges.
一年前，他有十一个学生获得了四年本科大学的奖学金。

Executive authority is vested in a Governor, popularly elected for a four-year term.
行政权被授予了一位被选举的行政长官，任期为四年。

I have a four-year-old daughter.
有一个4岁的女儿。

One year at a prep school left students with four years of eligibility at a four-year university, as opposed to two years of eligibility after two years at a junior college.
学生在预备学习一年之后，就可以准备进入四年制的大学或是两年制的初级学院学习了。

Four-year-olds have an overabundance of energy.
四岁的幼童有过剩的精力。

It will be phased in over a four-year transition period.
在四年的过渡期内，它将被逐步采用。