3-5 连续群(continuous group) 可以证明，绕z轴旋转角度α的操作作为一个集合R z (α)构成一个连续群（通常称为SO(2) 群），因为α是可以连续变化的。
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坦言之，在美国，还没有说哪一个板块或行业群是连续两个牛市的领涨者。
Tellingly, it hardly ever has been the case in the U.S. that a sector or industry group is the leader of two successive bull markets.
坦言之，在美国，还没有说哪一个板块或行业群是连续两个牛市的领涨者。
Tellingly, it hardly ever has been the case in the U. s. that a sector or industry group is the leader of two successive bull markets.
吉尼斯世界纪录协会承认这些大学生打破了2009年由美国迈阿密戴德学院的一群女生创造的连续朗读240小时的纪录。
Guinness World Records recognized the university students for breaking the previous record of 240 hours set in 2009 by a group of women from Miami Dade College.
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