fro [frəʊ]

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adv.往，回；prep.同；n.非洲发型

in one direction and then in the opposite direction , a repeated number of times

They travel to and fro between London and Paris.他们奔走于伦敦和巴黎之间。
The girl's pigtails swing to and fro as she runs.小女孩一跑，辫子就来回甩动。