After the Cold War, a transitional change had happened in the international security.
冷战后，国际安全形势发生了前所未有的转折性变化。
Since the beginning of the Cold War, international security crises have occurred frequently.
自冷战爆发以来，国际安全危机频频发生。
Since the beginning of the Cold War, international security crises have occurred frequently.
自冷战爆发以来，国际安全危机频频发生。
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