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It is still Simon, who believes that human "bounded rationality" is embodied in learning as "situational rationality"-learning wherever it is used. People's learning is restricted or promoted by situations. What you want to learn will be applied in what situation, then you should learn these things in what situation. For example, if you want to learn programming, you should learn it in GitHub, because you will program through GitHub in the future. For another example, if you want to learn bargaining skills, you should learn them in actual sales situations, because this skill is ultimately used in sales situations.白凡悠闲地喝了一口茶，淡然道：那又如何？我当时可没说这就是张家玉米，我还让他们好好问仔细问来着。影片讲述将犯罪组织成功转型成金融企业后，想要金盆洗手的黑帮二把手美玉(金惠秀饰)的故事。　　年轻时候的洪沧海，意气风发，在足球坛上赫赫有名，素以刁钻的“任意球”让人津津乐道。他最厉害的就是踢点球，能把球准确地送到任何位置，甚至直接入网。庞千户血液中，潜藏的优良基因被瞬间激活。Conclusion: As the name implies, singleTop, if the current instance is at the top of the current task stack, it will be reused directly to test scenario 1. If the current instance is no longer at the top of the stack, create a new instance, such as Test Scenario 2, because it jumps from FirstActivity to SecondActivity every time. Although the SecondActivity instance already exists at the time of jumping to SecondActivity for the second time, another SecondActivity instance is created because it is not at the top of the stack.Public class MySubject implementations Subject {