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What we understand is that if a single schema is instantiated, it will only be instantiated once. To implement a single schema, we simply use a variable to identify whether the class is instantiated. If it is not instantiated, then we can instantiate it once. Otherwise, we will directly return the instantiated object.香荽，你们一句一句地教他，不要念这么快，多了他咋记得住呢。吕馨说道：就算你说得再天花乱坠，我也不看。发展起来，并且逐步一统天下。谢广坤最近一直在反省，他觉得自己从小到大一直是个倒霉蛋，不管他做什么事，都会遇到意外，最后把自己弄得焦头烂额……Cabernet Sauvignon is a Eurasian species, also known as Sauvignon, and is sometimes transliterated as Cabernet. Originated from France, it is the most widely planted red grape variety in the world. Cabernet Sauvignon is the king of noble red wine brewing varieties and is an excellent variety of traditional red wine brewing.从多伦多回流的雪聪（陈豪 饰），多年来在香港不同的角落画下神秘图案，一直都未被任何人发现。直到最近，从长春南下当普通话老师的小雪（蒙亭宜 饰）偶然之下发现并成功破解，连起所有这些没有数字的点点图，一幅又一幅与从前的香港息息相关的图案、回忆活现於这个繁忙的城市。但究竟是谁留下这些图案？又会是谁把它连起呢？二人决定要在这个开埠170多年兼住了700多万人的城市，展开一场猜情寻游戏……