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3. Some classes, such as the core trading engine of the exchange, control the trading process. If multiple classes can be created, the system will be completely messed up. (For example, if there are multiple commanders in an army who command at the same time, there will definitely be a mess), so only by using the singleton mode can the core transaction server independently control the whole process.9项伯只得报上张良的大名，好在子房先生谨慎小心，安排更是处处妥当，未雨绸缪。Subjectively Down (SDOWN) refers to the offline judgment made by a single Sentinel instance to the server.Looking for customers is definitely not a aimless search. What we are looking for should be the target customers. Of course, we also need to make preparations in advance and carefully locate the target customers. What kind of people are our products suitable for, what kind of enterprises are useful to, and who are interested in our products now. Combined with these thoughts, the scope of customers is roughly delineated. Then, through the Internet and Yellow Pages, the information of the target customers is preliminarily mastered, and then the next marketing plan is prepared.