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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.Human's classification consciousness and practice on vegetation, animals and other organisms have existed since ancient times. They existed in ancient China and ancient Greece, and developed into a science-taxonomy. However, the early classification was mainly based on morphology, such as the shape of roots, stems and leaves. Taxonomy based on morphology is the oldest discipline in biology, and the earliest phyla, classes, orders, families, genera and species basically came from here. Taxonomy in the general sense refers to a specialized discipline that identifies, identifies, describes, names and classifies organisms. The task and purpose of taxonomy can be divided into two parts:根据阿·托尔斯泰的小说《苦难的历程》改编。Jilin ProvinceSettings > Notifications > Information: Turn off Display Preview但是实际物品和销售员口中的物品，呵呵……我也没有骗她，要怪就怪爱丽丝自己想得太美好了。