自从冷战结束，国际社区始终在努力寻找一种关于威胁的令人满意的定义。
Since the end of the Cold War, the international community has been struggling to find a satisfactory definition of the threat.
他始终在努力像比自己更优秀的人一样生活，从儿时的汤姆·索亚和大卫crockett。
He had always pretended to be people who were better than himself, starting in childhood with Tom Sawyer and Davy Crockett.
自从2003年入侵伊拉克以来，美国始终在努力工作并且试图维持伊拉克国内脆弱的稳定。
Since the invasion of 2003 America has worked hard and painfully to bring about a fragile internal peace in Iraq.
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