back and forth
01
来回, 前后
repeatedly going in one direction and then in the opposite direction
语法信息
adverb of place
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。
Back and forth
01
来回, 往返
a repetitive movement or action between two points
语法信息
有生性状态
抽象
形态构成
复合词
可数
复数形式
back and forths
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。
