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However, Jiang Min, vice president of the Real Education Fund, said that due to the high investment cost of offline institutions and geographical restrictions on their development, it is more optimistic about online education. At present, besides children's English, the demand for thinking ability training is very large and the market facing it is also wider. "Children's English has explored a relatively mature online development model, and their thinking ability can be used for reference. Moreover, users' acceptance of online education products is increasing day by day. It is relatively easy to start the market for education, and there are more talents who know the operation and management of online education. In addition, the cultivation of children's thinking ability pays more attention to the thinking process, and the requirements for expression and communication are relatively weak, and the demand for one-on-one teaching is relatively low. The cultivation of online thinking ability is likely to accelerate faster than the development of online children's English. "PS: Many forums have seen beginners ask whether WCF still needs to learn in depth, because they think these technologies may be outdated. Maybe Microsoft will launch a new SOA implementation scheme at that time. Wouldn't it be a waste of time to learn in depth, so they feel that there is no need to learn in depth and just know how to use them. I had the same feeling about this problem before, but now I think that although WCF technology may be replaced, the key to understanding a technology in depth is not to know some more advanced API calls, but to understand its implementation mechanism and way of thinking. Even if the latter technology is replaced, the mechanism behind it is definitely similar. Therefore, if you have a thorough understanding of a technology, you will feel familiar with the new technology and relaxed about it. In addition, after you have a thorough understanding of a technology, you dare to say that you have mastered the technology well during the interview, instead of saying that you use it a lot at ordinary times. Once you ask deeply, you do not know the implementation principle behind it. This is also why I want to write WCF series. I hope this opinion is helpful to some beginners.改编自加藤ジャンプ与土山茂漫画作品。以コ字型吧台的小酒馆为舞台的独特美食恋爱剧，通过客人和老间的互动而道出各式各样的故事。广告代理店“Shuee project”的职员・吉冈とり（浅香航大），每天忙碌地往返于公司和家，过着黑白的日子，在意料不到的状况而再遇到憧憬已久的惠子学姐（中村友理），大学时代在学姐推荐下，悄悄打开酒馆的门，一开始虽然有些困惑，但随着黄汤下肚，被菜色所感动，和老板主、客人一起在逐渐融洽的氛围下，沉醉于コ字型魅力之中，那里是至今为止都不曾体会过的宽广的乐园。The observer mode defines a one-to-many dependency relationship, allowing multiple observer objects to monitor a certain topic object at the same time. When the state of this topic object changes, all observer objects will be notified so that they can automatically update their behaviors. The specific structure diagram is as follows:若然人生是个舞台，台上总有被镁光灯照耀的主角，亦有光影外的配角。不过，台上充满陷阱，无论是主角或配角，也有机会中伏，随时跌得一蹶不振。只要不放弃，主角或配角都有一个华丽转身的机会，重新振作，演活一台人生好戏。