副詞 to and fro:

1. moving from one place to another and back again
   同義詞：back and forth, backward and forward

1. Scythes swished to and fro.
   長柄大鐮刀嗖嗖地來回?fù)]動。
2. The ship was rolling heavily to and fro.
   那船晃來晃去很不平穩(wěn)。
3. Trucks shuttled to and fro on the high ways.
   車輛在高速公路上穿梭行駛。
4. The cat made little rushes to and fro after the ball.
   貓追著球跑過來跑過去。