1.  written challenge to war
2.  letter of challenge

• 1. 战书: letter of challenge
• 2. 挑战书: challenge | Book Challenge
• 3. 硫磺岛战书: Letters from Iwo Jima

更多释义

• 1.那些开幕辞听起来更像宣战书而不是和平倡议。
  The opening speeches sounded more like declarations of war than offerings of peace.
  dict.yoduao.com
• 2.请战书像雪片似地飞向指挥部。
  Headquarters was swamped by an avalanche of applications for battle assignments.
  dict.yoduao.com
• 3.时间总是弄出一些最具性的挑战书。
  Here, TIME presents some of the most challenged books of all time.
  dict.yoduao.com

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