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However, it seems that it is deliberately against you. Just as you unpacked it, the package exploded.2) because of that limitation of t conditions, it is impossible to prepare t environment for each heterogeneous platform, resulting in incomplete testing and affecting software quality3. Some types, such as the core trading engine of the exchange, control the trading process. If multiple types can be created, the system will be completely chaotic. (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. The following is an analysis of some examples that we need to pay attention to when applying singleton pattern in the development process.　　嘉世一路过关斩将，即将冲进决赛之际，团队却遭遇危机。面对劲敌皇风战队来势汹汹，作为队长的叶秋要如何解决眼前的困境？这样一群怀揣梦想的少年，是否能够登上荣耀的巅峰？风流潇洒却性格桀骜不驯的孟良自幼在劈挂门炼就一身好功夫，但连续两年高考不中，其姐陵园冬恐慌其不学无术，遂找来昔日情人文武来辅导孟良。死敌，并各下战书约定在日后举办的全省跆拳道大赛上决一死战，为赢得比赛，孟良一改往日习性，拼命练习各种格斗技能，并多次利用与犯罪团伙交锋之时验证身手，最终在全省跆拳道大赛上利用骄兵必贩的心理将唐仁击溃。唐仁此后痛定思痛，认识到自身不足而奋起修炼，身手更加凌厉强悍，誓雪一败之耻。不久，在文武筹办的全国功夫之王擂台大赛上，孟良、唐仁再次对决，在遭遇前所未有的强劲对手之后，突然悟出武学真谛，熊熊战火中为人们奉上一场激情迸发的拳脚大战……照我说的，早已踏平拓林。