to-ing and fro-ing

剑桥词典

repeated movement from one place to another
来来回回；往复
Inevitably, when both parents have custody of the child , there's a lot of to-ing and fro-ing between them for the child concerned . 当父母双方都对孩子有监护权时，孩子不可避免地要在父母之间不断地来回奔波。
(also to-ings and fro-ings)
many different and repeated discussions and activities
纷繁复杂，繁琐，忙乱
The legal to-ings and fro-ings could delay the start of the trial . 繁琐的法律程序可能会使开审的时间推迟。 返回 to-ing and fro-ing