call sb up 和call up sb有什么区别

Call sb up是"打电话"之意,相当于ring up或telephone或phone. 如：
I'll call you up tomorrow.
我明天给你打电话.
另外,call upsb还有"回想起"之意.如：
Your letter called up the days when we worked together.你的信使我回想起我们一同工作的日子