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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.　　乔治参加了一个航模赛，但是他却一路遭到挫折，先是父亲没能帮他做好模型，当模型好不容易做成了，遥控器却在比赛那天被别人踩坏。在乔治每一次陷入困难的时候，正是斯图亚特机敏勇敢的出手相助，让乔治顺利过关。斯图亚特努力的付出，终于被小乔治接纳，这只小白鼠在乔治家中得到了温暖的归属。一天，小咕提出想回家和伙伴们在一起。康一为了让小咕了解外面的世界，悄悄把它带了出去。小咕发现环境已经面目全非，大吃了一惊，这个不适合就河童生存的地方根本就找不到伙伴。看到小咕难过，康一也不好受。他和小咕一起外出旅行，来到了还保存着河童传说的远野县。两人在美丽的大自然中找到了适合河童生活的地方，小咕愉快地在清澈的河里游了起来，康一也为它高兴。可是，在这里也怎么都找不到其它河童。康一听到村民们说“抓住一只河童能得一千万呢！”，赶忙带着小咕离开了那里。B women's 7 field events: 500m time trial, individual race (3 laps), 3000 m individual pursuit and scoring; Road events: 70km individual race, individual time trial mountain bike: cross-country因为疫情，本来只是约个炮而已，在被隔离期间能否成为我的朋友