back up例句

Some food labelling practices really get my back up.
有些食物标签的贴法实在让我生气。

He booted the ball 40 yards back up field.
他一脚踢出40码远，把球踢回前场。

Alternative treatments can provide a useful back-up to conventional treatment.
替代疗法能为传统的治疗提供有效的辅助。