up and down
短语词组
- up p and down 来来回回;上上下下;来回地
- up hill and down dale 翻山越谷;形容长途跋涉;拚命地
- Up Street and down Street 在街上走来走去
- up supply and down return 上送下回
- united at up -and down mine 井上下联合
- Up - and down-converters 上变频器和下变频器
- Pace up and down 徘徊;走来走去;停留;徘徊不前
- bob up and down 在水面上忽沉忽浮
- up and down structure 上下结构 返回 up and down