我快活自由，身体健康，积极乐观。I am happy and free, in good health, gay and cheerful.女孩子们拿着桶和铲子在沙滩上快活地玩耍。The girls happily played in the sand with buckets and spades.我正过得开心快活着呢.I'm having a rollicking good time....
10%至15%的离差是可以接受的。A 10 to 15 percent deviation is considered acceptable.因此, 表达需求量的理想术语应该是平均离差和标准离差.Thus , requirements should , ideally, be expressed in terms of a mean and standard deviation.根据标准离差, 优选组合出最优模型.Based on th...