短語詞組短語up p and down 來來回回;上上下下;來回地up hill and down dale 翻山越谷;形容長途跋涉;拚命地Up Street and down Street 在街上走來走去up supply and down return 上送下回united at up -and down mine 井上下聯(lián)合Up - and down-converters 上變頻器和下變頻器Pace up and down 徘徊;走來走去;停留;徘徊不前bob up and down 在水面上忽沉忽浮up and down structure 上下結構 返回 up and down