名词

1. He sits on his backside.
    他整整坐了一天什么事也没有做。

1. 背面：分析了低动压的背面(backside)着舰工作状态下飞行员仅控制飞机姿态无法控制飞行轨迹角的物理原因.研究了低动压的背面着舰工作状态下使用背面控制策略问题,即以推力来控制轨迹,以飞行姿态来控制迎角.设计了背面技术和前面(frontside)......

2. 内跳转：frontside 外跳转 | backside 内跳转 | manual 二轮平衡 后二轮

3. 后部：backside pumping 一台马达带动两口井抽油机 | backside 后部 | backsight 回视

1. 屁股
    Your backside is the part of your body that you sit on.

noun

1. the fleshy part of the human body that you sit on

    e.g. he deserves a good kick in the butt
           are you going to sit on your fanny and do nothing?

    Synonym: buttocksnatesarsebuttbumbunscanfundamenthindquartershind endkeisterposteriorpratrearrear endrumpsternseattailtail endtooshietushbottombehindderrierefannyass

2. the side of an object that is opposite its front

    e.g. his room was toward the rear of the hotel

    Synonym: rearback end