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2. The coupling between the publisher and the subscriber is reduced. The publisher only publishes a message, and it does not care how the message is used by the subscriber. At the same time, the subscriber only monitors the event name of the publisher. As long as the event name of the publisher remains unchanged, it does not care how the publisher changes. Similarly, the seller (publisher) only needs to tell the subscriber (buyer) about the arrival of shoes, regardless of whether the buyer buys or not, or whether he buys other sellers. As long as the shoes arrive, the subscriber can be notified.当世界只剩最后8秒，你敢不敢为爱勇敢一回？If you need to go to more than two scenic spots in one day, you strongly recommend a one-day bus ticket, which can be purchased in the stationmaster's room, the bus, the automatic ticketing machine and other places, which is very convenient.未观测的战略级魔法，将朝鲜半岛南端的军事都市及舰队消灭了。MDT members form a clear diagnosis and treatment proposal during the decision-making discussion process. MDT diagnosis and treatment recommendations should meet the following criteria:后者殷实简洁，将五千人的战役化为最直白的数字。