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- 要探讨爱尔兰问题的起因就要追溯到三百多年以前。
To trace the origins of the Irish problem, we have to go back over three hundred years.
- 骚乱的真正原因不明，但起因是由於逮捕了两名男子。
The real cause of the riot was unclear, but the occasion was the arrest of two men.
- 事故的真正起因仍有争议。
The exact cause of the accident is still in dispute.
- 那场战争的起因有几个。
Several causes operated to bring about the war.
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