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The principle of opening and closing means opening to expansion and closing to modification. When the program needs to be expanded, the original code cannot be modified, but the original code should be expanded to achieve a hot plug effect. Therefore, a summary of one sentence is: in order to make the program scalable, easy to maintain and upgrade. To achieve this effect, we need to use interfaces and abstract classes, etc. We will mention this point in the later specific design.算是在低谷，现在你差不多站在地平线了。清末民初的天津，叫花子孟来财为生计被迫卖掉小女儿小雪，偶遇落魄的德国军火商人韩奈根，他成功地帮助韩奈根打入朝廷，与北洋新军总兵签下订单。孟来财戏剧般的当上了德国洋行的买办，一夜暴富，从此周旋在尔虞我诈、相互利用的北洋军阀和德国、日本军火商之间。孟来财发财后一心想寻回穷困时卖掉的女儿，并娶颇有姿色的姚氏为妻，却不知她是日本人安插在他身边打探情报的一颗棋子。大女儿小云十分厌恶这个阴险的后妈，留洋回国后与一心争财的姚氏频频爆发战争。为求生存，孟来财小心翼翼地在陷阱重重的生意场和矛盾四起的家庭间挣扎。怎奈中德断交，孟来财被抄家，锒铛入狱，再度一无所有。他的遭遇随动乱时代的风云变幻而大起大落，为民族大义不惜舍弃荣华富贵，从贫贱到富贵再沉沦到一贫如洗的频频换位使他强烈感受到残酷并带有嘲讽意味的世态人生。林晚荣因为一次意外，来到明朝宣德年间的金陵，见到了和去世的妹妹长得一模一样的萧家二小姐。找到寄托的林晚荣化名林三，进入萧府成为家丁，并和大小姐萧玉若发生种种摩擦。萧家在一系列意外下，陷入危机，但林三利用现代智慧一一解决，不仅化解重重危机，更得到了萧玉若的赏识，两人也在相 处中互生爱意。 
　　在这过程中，林三发现萧家的危机并非意外，而是各方势力为了夺取萧家保管的先帝遗诏所致。林三八面逢源力挽狂澜，并被封为“天下第一丁”。The rear suspension of the new BMW 3 Series is relatively complicated, adopting a five-link structure, which is not much different from that of the previous generation BMW 3 Series in structure, but has been optimized in the structure of the link. The lower swing arm of the five-link independent rear suspension is very thick, and most of the impact of the ground face suspension is transmitted from the lower swing arm to the shock absorbing spring. In addition to controlling the swing track of the wheels, the lower swing arm and the lower rear control arm also have the function of adjusting the toe-in and camber angle of the wheels.剧集讲述了苏氏布商家的赘婿宁毅，帮助妻子苏檀儿一起搞事业，玩转武朝商界，成为江宁首富的故事；宁毅面对家事、国事、天下事，都勇往直前，从一个无人在意的小小赘婿，成长为真正为天下立心，为生民立命，顺应时代，也改变了时代的大人物。