up用作副词：
1、向上
Intense balls of flame rose up into the sky.
炽热的`火球冲上天空。
2、在上面，在高处
There's a research station perched 4000 metres up on the lip of the crater.
有个研究站坐落在海拔4,000米的火山口附近。
3、起床，起来
He stood up and went to the window.
他起身走向窗户。
4、向（或在）地势更高处
He was living up North.
他当时住在北部。
5、往，朝
The girl ran the rest of the way across the street and up to the car.
那个女孩开始跑起来，一路跑到街对面的汽车旁边。
up用作介词：
1、向上；向高处，向上游
The ship is sailing up the Nile.
这艘船顺尼罗河向上游航行。
2、在…上端，在…之上
There was a workman up the ladder.
有一个工人在梯子上工作。
3、沿着，靠着
A line of tanks came up the road from the city.
一排坦克由市里沿路开来。