“一生就应该拥有一次”英文是什么呢？

Should hold only one time during whole life.

treat myself(yourself) better

一生就应该拥有一次
The whole life should own once

更好的对自己
Better to oneself

一生就应该拥有一次:We should have a life
更好的对自己:Better on their own

One should own once.
Take better care of yourself.