His u recedented trip to pyongyang in june 2000 lifted the hopes of millio of korea 他在2000年6月，史无前例出访北韩，让千百万韩国人燃起希望。
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A software glitch with windows xp ， microsoft ' s new flagship operating system ， leaves users in u recedented danger according to the company ' s own security experts 据微软公司安全问题安全专家介绍，新王牌操作系统即视窗xp有软件缺陷，该缺陷可使用户处于空前的危险。
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Microsoft representatives say that the fault poses an u recedented risk because a user is vulnerable as soon as they co ect to the internet - no other action is required 微软代表说，因为不需采取其它行动，只要该软件用户联到因特网上就可能受害，所以该缺陷造成的危险是空前未有的。
