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2. How to realize the publish-subscribe mode?Nazhi's classmate chased him out: "Give me 50 cents." Li Shanglong thought he heard it wrong: "What?" The classmate said very seriously, "You just played for two minutes and gave me 50 cents."Public Enumeration < TreeNode > getChildren () {大家可能会发现，原野文中一章的内容经常是三千一二百，甚至三千三四百，那是因为先分好了章节，后来修改润色的时候，又添加上去的，但为了不影响情节的连续性，原野不会将多出来的字数移到下一章。7. Enter "" to run the class file just compiled.There is no doubt that people in the IT industry are extremely smart. Even in other industries, their work also requires wisdom and creativity. In the IT industry, it needs extremely cutting-edge research and development work. Modern industry has evolved to the foundation of the business world that includes generating and supporting information flow.As shown in the above figure, the server side provides NTP service. Attacker sends an NTP monlist Request to the server, but its source IP address is not its own IP address, but the IP address of the target. After the server receives the request, it will send a Response message to Target (not Attacker). Since Reponse contains 600 time synchronization records with Server, which is much larger than Request and consists of many messages, amplification is realized.