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张丹枫文韬武略，风流倜傥，虽然是张宗周的儿子，张士诚的后人，但却是个热血男儿，为不使汉人的江山被外族蹂躏，他秘密由瓦剌潜来中原，助明朝抵抗瓦剌的入侵，也先派人追杀他。明皇帝亦因其是张士诚的后人而要杀害他，武林豪杰在未明张丹枫的来意之前亦要杀他，张丹枫遭遇几许惊心动魄的危机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.Mary is sensitive by nature, cares about other people's attitudes and is easy to blame herself. Sometimes she wants to let go of these restraints and start over. "All those who have demands on me, when I die. Can I just think of myself as dead? I live a day for myself?"The observer pattern defines a one-to-many dependency, allowing multiple observer objects to listen to a topic object at the same time.Reference: Baidu Encyclopedia-iPhone