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。
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。
Back and forth I went with the slides.
于是，我就来来回回地放着幻灯片。
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。
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。
Which is, she could then either get back and forth between the two of them.
也就是说，她可以在两地间来回走动。
We travel back and forth all the time between Canada and England.
我们总是在加拿大和英格兰两地来回旅行。
They discussed it back and forth, without getting very far.
他们来来回回地讨论，没有很大进展。
Keep winking back and forth, then move your finger closer to your face.
继续来来回回地眨眼，然后将你的手指移到靠近你的脸。
The two departments adeptly pushed the ball back and forth into each other's court.
这两个部都很老练，把球来回地踢到对方的场地上去。
The pendulum of the old clock swung back and forth.
那座老钟的钟摆来回地摆动。
He liked the book very much and read it back and forth.
他非常喜欢这本书，来回地翻看。
He liked the book very much and read it back and forth.
他非常喜欢这本书，来回地翻看。
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