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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.Socks are high-frequency and low-cost consumer goods. People often ignore the influence of materials and designs on wearing experience and service life. However, holes, smells, dyes and heels are all real embarrassments in life.不然，哪天被人抓了壮丁，还是躲不过，还不能跟你在一起，不如早些跟你一块去倒好。境界谈不上，自得其乐而已。但狮虎一类的猛兽，则会守着自己的领地，对入侵者毫不留情地驱逐厮杀。20世纪70年代，一场大火把本来温馨的一家人拆散，警察蒋定邦认为妻儿已葬身火海，于是伤心前往英国。二十年后，回到香港的定邦在许多场合认识了香港上流社会的大亨齐乔正。但定邦觉得此人并非善类。一次杀人事件，被告人乔正的儿子齐浩南被告上了法庭。而这时，定邦才突然发现乔正的妻子正是自己以为已死去的前妻，而浩南就是自己的儿子！浩南视乔正为偶像，明知此事是乔正所为还是替他入狱。而另一方面，和乔正颇有渊源的石常春的女儿——石伊明从英国归来，数次邂逅了浩南。亲情与爱情、正义与邪恶在浩南的心中交织徘徊，二代人的恩怨情仇能否在浩南这代化解呢？