1. 意义和用法：
“Back and forth”指来回移动或者交换；常常用于描述人或物体在两个不同的位置或状态之间来回移动或者交替。可以用作名词、形容词或者副词。
2. 语法：
Back and forth可以用作一个复合副词或者短语，需谨慎使用。
3. 相关表达：
back-and-forth、back n forth、to and fro
例句：
1. The tennis ball went back and forth across the net.
2. He paced back and forth in front of the door, waiting for his girlfriend to arrive.
3. The negotiations went back and forth for several months, but finally a deal was reached.
4. The cat chased the laser pointer back and forth across the room, entertaining everyone.
5. The boat rocked back and forth in the rough waves, making me feel nauseous.
1. He keeps pacing back and forth in his room.
2. The game was very boring, just the ball going back and forth.
3. They argued back and forth about whether to invest in the stock market.
4. The children laughed and played back and forth on the seesaw.
5. The arguments in the debate went back and forth without any real resolution.
翻译：来回，往返
读音：bæk ənd fɔrθ
例句：
1. They went back and forth with their ideas until they finally came up with a workable solution.（他们一直在交换意见，直到最终想出了一个可行的解决方案。）
2. The two teams went back and forth in a heated debate over the proposed changes.（两个团队就建议修改进行了一次激烈的辩论，来回交换观点。）
3. I've been going back and forth trying to decide whether to accept the job offer or not.（我一直在权衡利弊，来来回回考虑是否接受这份工作。）
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