fro

1. Scythes swished to and fro.
   长柄大镰刀嗖嗖地来回挥动。
2. The ship was rolling heavily to and fro.
   那船晃来晃去很不平稳。
3. Trucks shuttled to and fro on the high ways.
   车辆在高速公路上穿梭行驶。
4. The cat made little rushes to and fro after the ball.
   猫追着球跑过来跑过去。
5. He is walking to and fro in the room.
   他在房间内踱来踱去。

fro

adv.（副词）
Away; back:
离开；回来：
例句：
moving to and fro.
来来回回的移动

prep.Scots （介词）【苏格兰】
From.
从

来源：
Middle English
中古英语
probably from Old Norse fr3 * see per
可能源自 古斯堪的纳维亚语 fr3 *参见 per