每日短语讲解 第1217期:上上下下
2019-05-12来源:和谐英语
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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。
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