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2. There will only be one instance per startup in the application. Such as account system and database system.　　他处处与小鹿作对，让小鹿恨的牙痒。培训结束后小鹿应聘进了旅行社，而对手的一家旅行社也把丁健挖去，小鹿没想到同她作对的老师又成了竞争对手，小鹿带团出游，不时闹出很多笑话，惹了不少麻烦，还总在最关键的时候心狂跳、莫名其妙晕倒……她对自己渐渐失去了信心，觉得度日如年，而她也在这样的日子中慢慢改变……如此，局面立刻扭转。Synchronous Event Demultiplexer: It is itself a system call that waits for one or more events to occur. The caller will be blocked when calling it until an event is generated on the synchronous event separator. For Linux, synchronous event splitter refers to common I/O multiplexing mechanisms, such as select, poll, epoll, etc. In the Java NIO domain, the corresponding component of the synchronous event separator is the Selector; The corresponding blocking method is the select method.秦旷就笑了，心里莫名地高兴起来：看来这个林队长是真的把香儿当妹妹关心了。"Initial Version"