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This is the basis of the opening and closing principle, and the specific content: interface-oriented programming, relying on abstraction rather than concreteness. When a specific class is used when writing code, it does not interact with the specific class, but interacts with the upper interface of the specific class.飞鹰应伯爵请求与考古学家艾达赴撒哈拉沙漠寻找纳粹藏金。他们刚出发即遭伏击，后又收留藏金副官的外孙女依尔莎加入寻宝队伍，途中历尽种种艰险和人力迫害。在躲避土人袭击时，一行人误入流沙区而陷入地底，却无意中发现了纳粹藏金基地。面对黄金，众人眼花缭乱，欣喜若狂。此时一神秘大汉突然出现，他就是当年参与埋金的侍卫之一，其他恃卫和副官均先后死于其手，于是，飞鹰一行人与神秘大汉展开了一场生死搏斗...《笑天家》以吉本兴业创始者吉本势的人生经历为基础创作，由女星葵若菜主演。讲述作为明治后期京都老字号药材店长女出生的主人公藤冈与丈夫藤吉一起经营曲艺场，把大阪变成欢笑之都的故事。A4.1. 2.4 lens, vitreous body.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.?Public class SourceSub2 implementations Sourceable {