casus ['keɪsəs]

例句:

• Intriguing Casus Belli system, where wars have specific goals from start to finish.
  宣战系统改良.战争也有目的了.
  
• "The subject was how to create a casus belli between Tehran and Washington," he said.
  来自NEWYORKER
• In 2002, President Bush, having decided to invade Iraq, was casting about for a casus belli.
  来自NPR