例句：
She paced up and down outside the room.
她在屋子外面来回走着。
My relationship with him was up and down.
我跟他的关系忽冷忽热。
The boat bobbed up and down on the water.
小船在水面颠簸。
I looked it up on the Internet.
我在互联网上查过此事。
Sales are well up on last year.
销量比去年大幅增加。
The ship broke up on the rocks.
船触礁撞碎了。
He continued working up until his death.
他一直工作到去世。
I often stayed up until two or three in the morning.
我经常熬夜到凌晨两三点钟。
Don't give up until you have exhausted all the possibilities.
只要还有可能就别放弃。
