The Texas, Oklahoma, Mexico heatwave and drought last year, Moscow the year before and Europe in 2003, were all exceptional events, more than three standard deviations outside the norm.
去年发生在德州、俄克拉荷马州和墨西哥的 热潮与干旱， 去年的莫斯科热潮 和2003年的欧洲热潮 都是不正常的现象， 这些事情的概率超过了正常值3个标准差。