Our life goes back and forth, up and down.
我们的生命前后上下起伏。
Now, he goes back and forth about his feelings for me.
现在，他不用来回他的感情对我来说。
He said he's leaning toward retirement but goes back and forth.
他说，他倾向于退休，但瞻前顾后的。
Just connect it to an air supply and the piston goes back and forth.
只要将它连接到一个空气供应和活塞在跑来跑去。
Just connect it to an air supply and the piston goes back and forth.
只要将它连接到一个空气供应和活塞在跑来跑去。
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