双: two; twin; both; dual误: mistake; error两次: twice发球失误: faulty service两次发球失误, 双误: double fault两次发球失误: double fault; two-down发球失误: fault service; faultservice; faulty service; miss serve; missed service; service miss; service out两次发球权: two hands; two-hands还有两次发球: two more传球失误: incomplete pass; toss miss击球失误: dub; fluff接球失误: fumble; muff; receive miss扣球失误: spike miss第二次发球: second service第一次发球: first service二次发球: first second serve一次发球权: one hand两次失误: double fault; doublefault第一次发球员: first server双误: double fault以棒头根部击球失误: heel最后一个上场的投球失误: curtain（双打）第一次发球员: first server第一次发球成功率: first serve average第一次发球得分率: first serve point average
