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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.张槐就出去，吩咐孙铁等人大开府门，并搬了数张桌子出去，分别摆在张府东、西和正面，两张一并拢，上面再架一张。Since the single mode is instantiated only once, the first call returns an instance object of a. When we continue to call, the instance of b is the instance of a, so aa is printed below.This is a more interesting part. I'm sorry that the text and the picture are sent separately, because the text is coded on the computer, but the computer browser is too slow to search the picture. Incidentally, I would like to say my notebook, it is really too! Slow down! Yes! I said I would replace it two years ago, but I still use it. As a notebook only used for code words, it runs too slowly.其中一个坟头上趴着一个白影，好似女人侧卧的样子，正对着他们，还微微晃动，似乎没有一点重量，飘来飘去的。　　另一边，演艺新人达夏（刘耀文饰）为与自己的偶像程以鑫签约同一公司而兴奋不已……夏正叹了口气，刚刚曹巡抚与我说，这里最好交给他们……君意如何？胡宗宪端起茶杯问道。