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The core idea is: when the state of the object changes, it changes its behavior at the same time, which is very understandable! Take QQ for example. There are several states, online, invisible, busy, etc. Each state corresponds to different operations, and your friends can also see your state. Therefore, the state mode is two points: 1. You can obtain different behaviors by changing the state. 2. Your friends can see your changes at the same time. Look at the picture:DNA，生命的本质，现在可以改变。 不仅是哈佛遗传学家和价值数十亿美元的公司，而且还包括叛逆的生物黑客在车库里工作。他不禁也起了兴趣。It is best not to win against team C, because once you win, you will play against team C in case you win again.7.1 Chronic respiratory diseases and dysfunction are unqualified.“凤凰山游击队”经重新组建成为一支以特务营营长聂天鸣为首的“新四军猎豹突击队”，他们立志与敌寇一决生死。为对抗敌寇，拯救大兵，策反军官，深入敌营，有勇有谋，中过记，也有牺牲，更能将计就计，最终赢得一轮胜利。