back and forth
01
来回, 前后
repeatedly going in one direction and then in the opposite direction
例子
The pendulum swung back and forth, marking the passage of time.
钟摆来回摆动，标志着时间的流逝。
The children played catch, throwing the ball back and forth.
孩子们玩接球，把球来回扔。
Back and forth
01
来回, 往返
a repetitive movement or action between two points
例子
The debate continued in a heated back and forth between the two speakers.
辩论在两位演讲者之间激烈的来回中继续。
The children played a game of back and forth with the ball, tossing it between each other.
孩子们玩了一个来回的球游戏，互相投掷。
