challengen.挑战;邀请比赛;盘问;质疑v.向 ... 挑战;盘问;质疑
challenge of century世纪挑战
challenge a statement驳斥声明
challenge advertising挑战性广告
Challenge or Overturn挑战或颠覆
Challenge Cup Contest挑战杯
challenge inoculation挑战接种
challenge of problems难题考验
challenge feeding test诱发性喂食试验
challenge and solution挑战与对策
challenge to the polls[法] 对某陪审员出庭的反对, 要求某陪审员回避