"away, backwards," c. 1200, Northern English and Scottish dialectal fra, Midlands dialect fro, from Old Norse fra "from," from Proto-Germanic *fra "forward, away from," from PIE *pro- (see pro-). The Norse word is equivalent to Old English fram, thus fro is a doublet of from.
雙語例句
1. She stood up and began to pace to and fro.
她站起身，開始來回踱步。
來自柯林斯例句
2. The boat was rocking gently to and fro in the water.
小船在水中輕輕地來回搖蕩。
來自柯林斯例句
3. They travel to and fro between London and Paris.
他們奔走于倫敦和巴黎之間.
來自《簡明英漢詞典》
4. The girl's pigtails swing to and fro as she runs.