1.上上下下,忽上忽下
2.各处,到处;来来去去
3.升降浮沉
1.rising and falling, or from bottom to top
2.backward and forward
3.sometimes happy and well and sometimes not
1.Sometimes, for variety, I looked up and down the street to see what the neighbours were up to.
有时候，为了换点花样，我会看看街道前后，看邻居们都在干些什么。
2.'These bob up and down as if on elastic. They have a radar detection device to help them avoid spider webs'
这种蝴蝶忽起忽落，就像有弹性一样。它们有一种雷达探测装置，可以帮它们避开蜘蛛网。
3.now his fingers went up and down, up and down, on the piano, taking strength against the great day.
现在他的手指在琴键上不停地上下来回移动，以积累力量迎接伟大的日子的到来。
4.Things have been a bit up and down with the national team because I've not played too much football for my club.
国家队比较起伏，因为我在俱乐部打的比赛不多。
5.Looking back, they saw the timid little dog on the other side of the stream. He was running up and down the bank.
回过头，他们看见他们胆小的小狗就在河的对岸，它在岸上又蹦又跳。
6.He was ready to make a fool of me, but I know my stones. He looked me up and down.
他想要敲我一笔，却没想到我很了解宝石。他开始上下打量我。
7.When markets are wrenching up and down, he adds, 'It takes a very secure person to say, 'I don't have to trade. ''
他还说，如果市场上下波动，要很有把握的人才敢说，我用不着交易。
8.The Great Wall winds its way up and down the mountains like a giant dragon, disappearing into the vault of heavens.
长城巨龙般地在群山中蜿蜒起伏，消失在天穹中。
9.Petya had been strutting up and down in silence.
彼佳沉默地在房里踱来踱去。
10.They like the long ball . . . Milan are very skillful but up and down.
他们喜欢长传……米兰则非常富于技巧，但总有起伏。