每日短语 第1217期:上上下下

今日短语：
up and down.

上上下下，来来回回

例句：
He ran up and down the steps several times to get some exercise.
他上上下下的跑了几回楼梯来做点运动。
The bear is walking up and down in the cage.
那只熊在笼子里来回走动着。