up用作副詞：
1、向上
Intense balls of flame rose up into the sky.
熾熱的火球沖上天空。
2、在上面，在高處
There's a research station perched 4000 metres up on the lip of the crater.
有個研究站坐落在海拔4,000米的火山口附近。
3、起床，起來
He stood up and went to the window.
他起身走向窗戶。
4、向（或在）地勢更高處
He was living up North.
他當(dāng)時住在北部。
5、往，朝
The girl ran the rest of the way across the street and up to the car.
那個女孩開始跑起來，一路跑到街對面的汽車旁邊。
up用作介詞：
1、向上；向高處，向上游
The ship is sailing up the Nile.
這艘船順尼羅河向上游航行。
2、在…上端，在…之上
There was a workman up the ladder.
有一個工人在梯子上工作。
3、沿著，靠著
A line of tanks came up the road from the city.
一排坦克由市里沿路開來。