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Singleton mode refers to ensuring that there is only one instance of a class and providing a global access point. It solves the problem of the number of entity objects, while other builder modes all solve the coupling problem brought by new. The main points of its implementation include:在报馆任职的骠叔（董骠 饰）因为工作的关系带着全家到加拿大工作。一家五口都全身心投入新环境新生活中，骠叔却因得罪上司被解雇了。由于大女儿、二女儿（李丽珍 饰）已开始了学业，他唯有带着妻子骠婶（沈殿霞 饰）与最小的女儿回到香港继续生活，生活却比以前更艰难了。骠婶无意中发现了一张加拿大的头奖彩票，奖金是两千万加币。由于不够钱到加国，骠叔硬着头皮向旧上司借。同样受到经济危机的上司设法要夺取骠叔的彩票。骠叔一家顽强对抗，保住了彩票，却无法在领奖时限截止前赶到。一家人伤心流泪，悲伤之中发现时间上出现了时差，领奖的时间还没截止。为了成为职业选手来到德国的手冢和成为美国代表的龙马成为日本代表的敌人中，「U-17世界杯」开幕——。若实在不成个样子，就取消此举，只许她们跟着军中大夫救治伤患。公子。　　大妹小圆（伍咏薇饰）性格内向、害羞，后认识了富家子弟冯泰来（孙兴饰），两人的感情突飞猛进，就在即将谈婚论嫁之际，婚事却因海珠的介入而节外生枝……? This mode is an improvement on the common factory method mode. In the common factory method mode, if the passed string is wrong, the object cannot be created correctly, while the multiple factory method mode provides multiple factory methods to create the object separately. Diagram: