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Although the above code can meet the requirements, it is not easy to expand and difficult to read. If I want one or two conditions in the future, if I want to recharge 300 yuan successfully, I can win the 150 yuan red envelope, then I have to change the code inside at this time, so the coupling between business logic and code is relatively high, and I accidentally correct the wrong code. At this time, we try to use the responsibility chain mode to transfer objects in turn to realize it.老兵无奈，只得心里求了句神仙，敲镰去点火。可是潜在的风险也是巨大的，将来的路更难走了。来到这间荒废的老屋，中年人有些明白爷爷当年的固执。真要赢了，那就是几十万的银子，他只肯请吃酒。Now is the best time to dye persimmons, because persimmons are green and rich in tannins. Persimmon dyed fabrics are crisp and anticorrosive, and will not have peculiar smell after sweating. The color will deepen after sun exposure, also known as "sun dye".