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back and forth
01
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repeatedly going in one direction and then in the opposite direction
例子
The boat rocked back and forth with the gentle movement of the waves.
The pendulum swung back and forth, marking the passage of time.
The swing swayed back and forth as the child enjoyed the playground.
The windshield wipers moved back and forth, clearing the rain from the car window.
The children played catch, throwing the ball back and forth.
