up and down基本解释

,上上下下；到处；前前后后；来来往往,同近

up and down相关例句和用法

The escalator wafts us up and down every day..自动扶梯天天送我们上上下下。

up and down英英释义

上上下下英释中释to a higher position and then a lower position, several times