challengen.挑战；邀请比赛；盘问；质疑v.向 ... 挑战；盘问；质疑challenge to panel[法] 反对陪审团出庭challenge position要求职位challenge to a duel决斗的挑战challenged networks受限网络challenge for cause[法] 有正当理由的反对challenge principle回避原则challenge procedure质疑程序challenge flag flag［体］挑战旗challenge attention值得注意challenge criticism对批评／评论表示异义, 招致非难