up-and-down
音标: ['ʌpən'daun]
up-and-down是什么意思、up-and-down怎么读
a. 一上一下的, 时起时伏的
up-and-down汉语翻译
a. 一上一下的, 时起时伏的
up-and-down英语解释
副词 up-and-down:
- moving backward and forward along a given course同义词：up and down
- alternately upward and downward同义词：up and down