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　一片雪花飘过冰封的地球和列车，刚刚得到的自由又变得混乱，因为肖恩宾饰演的雪国列车创造者Wilford回来了，与Layton针锋相对。杜心生和俞佩佩是同学，两个人感情深厚。俞佩佩的外婆何音是音乐学院的教授被红卫兵当成反动学术者给揪出来，经常被拉去批斗。杜心生和弟弟杜心根对俞佩佩十分关爱。为保护俞佩佩家里的那把珍贵的意大利大提琴不被红卫兵抄走。杜心生去找在海关钟楼工作的父亲帮忙，杜父将大提琴藏在钟楼里面。梧桐里迎来知青上山下乡的高潮，大妹妹杜心芳决意报名去安徽泾县插队，老虎灶爷爷收养的孙子阿大是独子不用下乡，但为了心芳，他也准备离开。胖嫂送走了大女儿曼娟，她要远赴云南。杜父因病去世，杜心生顶替父亲成了海关大钟的守钟人。这样他就不用下乡了。苗师傅带领着这个徒弟每天维护大钟，讲解海关大钟的来历以及大钟的各个部件的构造和原理。心生每天和大钟为伍，深深地爱上大钟，擦拭大钟，维护大钟，以致到了痴迷的地步。心芳和阿大在农村劳作，相爱，偷尝禁果。心生接到泾县的电报，立即赶去乡下。原来心芳怀孕了，阿大因流氓罪被发配到原始森林去当护林员了。心生把妹妹带回了上海。毛阿大向心生发誓，争取好好表现早日回上海与心芳团圆。为凑够学费，颜晓希不得不在乒乓球俱乐部打比赛赚奖金。赛场上，颜晓希凭借绝招“旋风球”打赢了对手齐景浩和厉圣，获得奖金。齐景浩一心想学“旋风球”，被迫拜师颜晓希，二人成为了一对鸡飞狗跳的欢喜冤家。正在二人感情升温之时，厉圣加入了腾远学院，高调追求颜晓希。这场光速打脸的酸甜三角恋正式开始。将他们的表演升华为娱乐，翻滚的舞台演出和大胆无畏的摄影工作。忙道：是三姑娘让我来的，说是能帮着跑个腿什么的。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.