All in all, he's more learned than he was ten years ago.
总的说来, 他比10年前更有学问了。
He ran away as a boy thirty years ago, and his family has never heard from him since.
30年前他还是孩子的时候就离开了家, 从此, 他家里人一直没有得到他的消息。
I've kept up a friendship with a girl I was at school with twenty years ago.
我一直同工同20年前上学时的一位女同学保持着友谊。
