challenge to

• On the blog ' s challenge to the traditional mainstream media
  论博客对传统主流媒体的挑战
• Developments of and challenges to latin america
  浅析拉丁美洲的发展与挑战
• He ' s thrown down a challenge to the japanese martial arts world
  他向全日本武士道挑战
• He ignored the sentry ' s challenge to halt
  他不理睬哨兵喝令止步的盘问。
• The feminist challenge to contemporary economics
  女性主义挑战现代经济学
• The college entrance exam is a real challenge to students ,
  高考对学生来讲是真正的挑战,
• New challenges to philosophy in the new century
  新千年哲学面临的新挑战
• Speaking in public is a challenge to a lot of people
  对许多人来说，公众演讲是一大挑战。
• Challenge to financial management in knowledge economy times
  知识经济与财务管理面临的挑战