challenge

• Mr. smith challenged chairman's ruling .
  史密斯先生不服从主席的裁决。
• The scaling problem is the most challenging .
  结垢是最复杂的问题。
• They offer little challenge or autonomy .
  它们没有什么战斗性或主动权。
• The challenge for mr. kemper was manifold .
  肯珀先生面临的问题是复杂的。
• What did he do in reply to your challenge ?
  你提出与他较量，他作何反应？
• We were thus facing a crass challenge .
  我们就面临着粗暴的挑衅。
• Angry critics challenged the finding .
  忿怒的评论者对研究结果提出了异议。
• The challenge of invasion had definitely weakened .
  入侵的威胁已显然减轻。
• I felt as if she challenged him to run away .
  我觉得她好象要逼着他溜跑似的。
• New times define new challenges .
  新的时代具有新的战斗任务。