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- Work the string up and down. 上下活动钻具。
- He jerked the string up and the puppet jumped. 他猛拉绳子，木偶就跳了起来。
- The old man stared the uninvited guest up and down. 老人把不速之客上下打量了一番。
- 6Work the string up and down. 上下活动钻具。
- He was walking up and down the station platform. 他在火车站的月台上走来走去。
- They were jigging up and down to the music. 他们随着音乐的节拍轻快地上下跳着。
- Each point of the string oscillates up and down with its amplitude determined by whether the interfering waves are reinforcing or canceling each other. 线上每点振动的振幅决定于该点两干涉波是相互加强还是相互抵消。
- The leaping theme and the string's accompaniment of the tuba throb are combined, before the piano part of the latter runs madly up and down the keys several times. 跳跃主题、弦乐的伴奏和大号跳动的声音加了进来，然后钢琴部分疯狂地在键盘上上下弹奏数遍。
- He got up, and began to pace up and down the room. 他起身并开始在房间里踱来踱去。
- The boy stared up and down at his reviler. 男孩子上下打量这个谩骂他的人。
- We bumped up and down along the gravel path. 我们沿砾石小路颠簸而行。
- A butterfly is flying up and down among the flowers. 有一只蝴蝶正在花丛里忽上忽下地飞着。
- The teacher was walking up and down in the classroom. 老师在教室里走来走去。
- The price of petrol is going up and down like a Yo-Yo. 汽油的价格像悠悠一样忽上忽下。
- He paced up and down (the platform), waiting for the train. 他(在月台上)踱来踱去等候火车。
- The girls jumped up and down and waved their arms with abandon. 那些女孩子跳上跳下尽情地挥舞着手臂。
- He leapt up and down in sheer outrage. 他气得暴跳如雷。
- He walked up and down the room between his books like a wild animal in a cage. 他在屋里的书堆中来回踱步，犹如笼中困兽。
- The product itself is prepared in bottling plants up and down the land. 该产品是在全国各地地瓶装工厂灌瓶的。
- Every one must have his share of the ups and downs. 每个人都有得意时和失意时。
