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back and forth
01
来回地, 反复地
repeatedly going in one direction and then in the opposite direction
Example
The pendulum swung back and forth, marking the passage of time.
钟摆来回地摆动，标志着时间的流逝。
The children played catch, throwing the ball back and forth.
孩子们在玩接球游戏，来回地扔球。
