1、up with 拿起，举起；拥护；
2、up in [口]精通；
3、up and down 上上下下；到处；前前后后；来来往往；
4、up on 熟悉；精通；
5、up and doing 敏捷；忙碌；活泼
He built up the business over a period of ten years.
他用了十年时间把这个企业创建起来。
She met up with some of her old school friends.
她遇见几个老同学。
He came up to me and asked for a light.
他走到我跟前来借火。
