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Explain that in the OrderPizza method, we do a lot of things, including calling the CreatePizza method to generate a desired pizza, and then doing a series of operations on the pizza. The key point is that Pizza is defined as an abstract class, which means that in the OrderPizza method we don't care what type this Pizza is at runtime, in other words, this is decoupling. The coupling between PizzaStore and Pizza is uncoupled.新世纪的钟声已经敲响，蓦然回首，我们发现在硝烟弥漫的商战中，人类的良知与正义是那样的可歌可泣。The "hedgehog" technique is a very effective one among all kinds of questions to promote business transactions. The so-called "hedgehog" reaction is characterized by you using a question to answer the customer's question. You use your own questions to control your discussions with customers and lead the conversation to the next step in the sales process. Let's take a look at Hedgehog's reactive questioning method: Customer: "Is there any cash value in this insurance? "Salesman:" Do you attach great importance to the question of whether the insurance policy has cash value? Customer: Absolutely not. I just don't want to pay any extra amount for the cash value. "For this customer, if you just sell him cash value, you will push yourself into the river and sink to the bottom. This person does not want to pay for the cash value, because he does not want to regard the cash value as an interest. At this time, you should explain to him the meaning of the term cash value and improve his understanding in this respect.瓦尔给住在圣保罗的法比尼奥做了13年的保姆。虽然经济状况稳定，但她必须离开自己的女儿杰西卡，为此她深感愧疚。杰西卡一直由生活在巴西北部伯南布哥州的亲戚抚养长大。随着高考逐渐逼近，杰西卡想到圣保罗备考。只是她到后才发现同居生活是不容易的。每个人都有自己的个性，杰西卡的率真让瓦尔发现自己处于两难的胶着境地。第65届德国柏林电影节全景单元观众选择奖。Fire water source根据地出了内奸，特派员老吴不得已把情报告诉了大壮，让大壮通过刘庄马大爷把情报告诉老洪。不巧马大爷刚好被捕。送情报的任务只能落到大壮和正好赶来的虎子、小银三个孩子身上。本剧将以黑色喜剧的方式向观众如实呈现爱丽丝在伴侣去世后所经历的一段充满悲伤与爱的人生旅程。男人们往往喜欢把他们不愿意面对的东西塞进角落里藏起来，因此，在伴侣去世后，爱丽丝震惊的发现自己陷入了一场生死攸关的、充满欺骗与混乱的迷局中。