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Time (S)In recent years, the concept of 10,000 hours has become very popular, but the actual 10,000 hours is not a universal truth. There are many restrictions. Most people do not know that 10,000 hours under "deliberate practice" are only useful. However, there has been a lack of systematic exposition on how to practice deliberately. Many books are relatively simple, and this book focuses on this topic. Deliberate practice is a higher-level learning method, which can make you improve your learning effect and shorten your learning time in a short period of time, and make you go to the road to excellence.受到歌剧院老板黑泽和马的邀请，金田一、美雪和剑持警部再次造访歌岛。金田一不知为何有种不祥的预感，他的预感果然实现了。和怪人幽灵寄来的预告书一样，在密室状态下的剧场里饰演卡尔罗达的女演员遭到残杀，从此揭开了连续杀人的序幕！　　看见有作者设调查，原野也学着放手一次：在未来情节还是大纲状态的时候，把香荽和紫茄的未来交给你们决定（因为她俩的选择对本书的大方向有影响，不是其他人可比的。Two patterns involving event distributors are called Reactor and Proactor. Reactor mode is based on synchronous I/O, while Proactor mode is related to asynchronous I/O. This article mainly introduces the knowledge related to Reactor pattern.