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2. After entering Google Earth, click Enter Flight Simulator in the toolbar.　　罗马浴场作者跨越时空的奇迹喜剧，在此开幕─！赵锋听了不耐烦，怒喝道：外面那么多人看，不进来我去哪？本将军还想问问情况呢。吕馨翘了翘她好看的鼻子，有些无奈的说道：这事要从七十多年前说起。If I were to implement a pizza ordering system, I would definitely write the code like this, because this kind of code can be written subconsciously without consuming our brains. However, take a closer look at this code: the purpose of this method is to order pizza. However, the code for ordering pizza also needs knowledge about the production of pizza. This method must know all pizza. Worse still, if the types of pizza are to be expanded or pizza with poor sales volume are to be deleted in the future, then the code for ordering pizza will be modified. It looks very bad and should be revised. Our first step must be to separate the code for producing Pizza from the code for ordering pizza, because you should not let the code for ordering Pizza know the logic for producing pizza, but should hand over the logic for producing Pizza to a special type. In this way, we can cope with future changes-if we want to add or delete pizza, we can directly modify the producer of pizza without affecting the logic of ordering pizza.