three years after 和after three years 区别?

three years after 和after three years 区别? Hope after three years, in和after都表示时间时有什么不同ex:In the three years After three three years after his flight over the North Pole After three years,whether you still remember me or not! If there is love,three years after we three-year-old 和 three years old 有什么区别 three -year-old 和 three years old有什么区别? three years after 用法three years after his flight over the North Pole.此句中 “三年后我要去悉尼”,这个“三年后”,是three years later,还是after three years?或者 “after five years”和“five years later”有什么区别