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Similar to the development of children from appearance and color to older children, they can be classified according to concepts. For example, if they know the concept of "food", no matter what kind of vegetables they look like, they should be classified into one category. The classification of biology has also developed in this way. The earliest method is to identify and distinguish species according to phenotypic characteristics, and to classify them step by step according to the degree of phenotypic similarity, so as to establish a classification system that is easy to retrieve. This is the principle of phenotypic classification. However, the problem of phenotypic classification is that it is difficult to reveal the essential laws of things. Many creatures with very different shapes may have kinship relationships. For example, the online sentence "When I knew sunflowers belonged to Compositae, I collapsed" is what it means."Life is saved, But the wound was too deep and too big, If you think about it, such a big muscle has been bitten down, Don't say it was in the '80s, Even now, it is not easy to cure. What's more, he was still on the front line at that time. I have only a little bandage, iodophor, anti-inflammatory drugs, painkillers and other simple medical supplies on hand. Where can I handle such a serious trauma, Finally, when the battle is over, When he was taken to the rear field hospital, The doctor couldn't help it, He amputated his leg, And also said to him, It is fortunate that such a serious trauma did not die of excessive blood loss and wound infection. Later, the state gave him a disability assessment and paid him regular living expenses and pension every month. I also visited him several times after I retired from the army. Although I married and had children and lived fairly well, my leg will never come back. "In the Korean documentary "Dear, Don't Cross the River", 98-year-old grandfather and 89-year-old grandmother gave each other the warmest companionship in their whole lives.这是一部描写中华民族在近代史上首次将侵略者彻底打出国境的气势磅礴的全景式长篇作品。1941年，随着滇越铁路被切断，日军横扫东南亚的战略图谋昭然若揭。半壁沉沦的中国连接外界的唯一血脉滇缅公路岌岌可危！赋闲多年的滇军中将段仲仪被紧急召至重庆。蒋介石亲自接见并倚重甚切。从此，熟悉欧美军界的段仲仪便承担起与盟国军事协调的重任，把个人和家族命运与可歌可泣的中国远征军紧密联系在一起。他战前赴仰光搜集情报，提供统帅部运筹帷幄；战端一开遂奔赴前线，积极参与缅战筹划和盟军指挥层的协调，并为弥合史迪威和蒋介石、杜聿明的矛盾做了大量工作。戚不才，只求平倭乱，驱鞑虏。爹想，那周姑娘刚才说，她在街上跟人打听张杨叔的事，被黎章听见了，黎章追问她跟张家是什么关系，还好几次揭穿了她的谎言，很不相信的样子。Publish-subscribe mode is also called observer mode. It defines a one-to-many relationship between objects, allowing multiple observer objects to monitor a topic object at the same time. When an object changes, all objects that depend on it will be notified.