他来回踱步。
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。
She rocks back and forth on her chair like a mischievous child.
她在椅子上前后晃动，像个调皮的孩子。
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。
A flock of sheep is walking back and forth on the grassland.
一群羊在草原上来回走动。
They continue calling back and forth until they all find each other again.
他们不停地来回打电话，直到他们再次找到彼此。
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。
Don't move those flowerpots back and forth.
你别来回摆弄那几盆花了。
They maintain a precarious balance only by careening wildly back and forth.
他们仅靠胡乱向后倾或向前倾来保持不稳定的平衡。
Back and forth I went with the slides.
于是，我就来来回回地放着幻灯片。
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。
Slip into a chair or remain upright, and sway back and forth.
滑进一张椅子中，或者保持直立，来回的摇晃。
One of our favorite tricks involves navigating back or forth through our page history.
我们最经常做的动作之一就是在我们的浏览历史中来来回回。
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。
My dog always springs forth when I go back home.
我一回到家，我的小狗就会跳到我的面前。
Some self sealing argument move back and forth from interesting to false claims.
有些自我封闭式论点来回变化,从有趣的到错误的宣称。
I see some people changing back and forth from one and two.
我看到一些人在一和二之间来回改动。
This back and forth loading takes time and may not be what you want.
这样的来回加载很耗时，而且可能也不是你所期望的。
There has been so much controversy and back and forth on this over many years.
许多年来，这一问题引发了巨大的争议，出现了许多反复。
So energy can go back and forth.
所以能量可以来来往往。
Paul already was starting this connection, and he's writing letters back and forth.
保罗已经开始建立这种联系，他经常写信回信。
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。
Then I let it sink and began to drag it slowly back and forth.
接着我将它沉入水中，开始缓慢地来回拖动。
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。
Breathe in and out; then switch back and forth.
吸入、呼出，然后再切换往复。
So, you see how we are oscillating back and forth?
你可以看到我们如何前后摆动？
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。
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。
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