adv.在动著；在进行中
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。
That was 40 years ago, but of course you wouldn't remember it. 那是40年以前的事，你自然想不起来了。
adj.出海的；用于航海的；从事航海的
