The windshield wipers clacked back and forth.
挡风玻璃上的刮雨器来回刮着，发出咔嚓声。
A bus shuttles passengers back and forth from the station to the terminal.
一辆公共汽车在火车站和公共汽车终点站之间往返运送旅客。
She passed the needle through the rough cloth, back and forth.
她用针在那块粗布上来来回回地穿进穿出。
A flock of sheep is walking back and forth on the grassland.
一群羊在草原上来回走动。
It'll have to make three trips back and forth for the three trees.
那样就需要为了这三棵树而往返三次。
He continued walking back and forth, muttering to himself; he had forgotten the King entirely.
他不断地走来走去，喃喃自语；他完全忘记了国王。
You might experience a flipping back and forth, from one to the other, then back again, when you stare at the picture.
也许你凝视图像的时候，不断看到它从一个跳到另一个，然后再跳回来。
Back and forth I went with the slides.
于是，我就来来回回地放着幻灯片。
Waiters came back and forth to bring cocktails to the rich customers.
侍者们忙前忙后的为这些富有的客人们送上鸡尾酒。
By applying a current, they were able to shuttle the particle back and forth.
使用电流，他们可以来回地移动毫微管内的铁粒子。
To start, stand with one foot in front of the other and shift your weight back and forth (versus around in a circle).
开始时，双脚前后站着，把身体的重量前后甩动（与绕圈甩动不同）。
After a back and forth, we mentioned the Mandarin name and got on the road.
这样打了一个回合之后，我们提到了大厦的中文名字，出租车这才顺利地上了路。
They may move back and forth between the U.S. and the home country.
他们可能在美国和自己的祖国之间搬来搬去。
All day long he flies back and forth from his branch to the feeder.
这一整天，他在喂料器和枝桠之间来来回回。
You could even do this go back and forth on the rope.
你甚至可以,在绳子上前后行走。
Throughout the morning, she moved back and forth between the kitchen and the living room.
整个早上，她在厨房和起居室之间来回奔走。
A man got into the well and ran back and forth to make it work.
一个男人进入舱内然后来回跑动从而使其工作。
He ran back and forth and did not touch the clown with his feet.
他来回地跑而且没有用他的脚碰小丑。
The Internet is more than just passing bits back and forth.
互联网不仅仅是来回传送比特。
The brothers spent the night going back and forth with their rice.
兄弟俩用整夜的时间往返运送大米。
The custodian could see him darting back and forth in the darkness.
看守人看见他在黑暗中奔来跑去。
The buoy floated back and forth in the water.
浮标在水里漂来漂去。
example：Someone was pacing back and forth behind the curtain.
有人在幕布后踱来踱去.
Through back and forth conversations, they increase the resilience of the whole community.
通过反反复复的对话，它们增强了整个团体的恢复力。
A large pendulum swung back and forth inside the grandfather clock.
落地式大摆钟里的大钟摆来回摆动。
He tried to calm the screaming baby by rocking it back and forth.
他将宝宝前后摇动为的是使尖叫的他平静下来。
The machine then moves back and forth across her finger, creating a coloured flower design.
之后机器就在她手指周围来回移动，一个色彩斑斓的花朵图案便出现了。
The machine then moves back and forth across her finger, creating a coloured flower design.
之后机器就在她手指周围来回移动，一个色彩斑斓的花朵图案便出现了。
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