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研制一种新的防空系统需要很长时间。尽管自冷战结束至少有六年之久,然而当前大多数正在研制的系统仍然带有过去10年威胁的迹象。
It takes a long time to develop a new air defense system. Although at least six years have passed since the end of the cold war, most systems under development today still show signs of threats over the past decade.