back ·phrase
Definition: in one direction and then in the opposite direction, often many times Level: C2
她随着音乐来回摇摆。
She swayed ___back ___and ___forth to the music.
今年夏天，她在罗切斯特和纽约之间来回开了好几次车。
She drove ___back ___and ___forth between Rochester and New York several times this summer.
最后，在来回走了很多路之后，我们找到了一条路，并沿着它走到了镇上。
Finally, after much walking ___back ___and ___forth, we found a road, which we followed till we got to the town.