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Industry 4.0 proposed by Germany has three major themes: first, intelligent factories, focusing on intelligent production systems and processes, and the realization of networked distributed production facilities; The second is intelligent production, which mainly involves the production logistics management of the whole enterprise, human-computer interaction and the application of 3D technology in the industrial production process. The third is intelligent logistics, which integrates logistics resources mainly through the Internet, the Internet of Things and the Internet of Services to give full play to the efficiency of existing logistics resources.F4从英德学院毕业了。道明寺邀杉菜一起到西班牙毕业旅行，但两人却又吵架赌气，眼看巴塞隆纳之行即将泡汤，F3于是用计将这对别扭的情侣送往巴塞隆纳，为两人制造机会。受到花泽类“秘密信函”启发的道明寺，买下杉菜在市集看中的一只流星戒指，暗中安排一切，准备在巴塞隆纳近郊一座有著幸福传说的教堂里向杉菜求婚，不料，途中却发生一场意外，留下杉菜一人在教堂前苦苦等候。随著时间流逝，道明寺的无故失踪让杉菜开始感到不安，心慌意乱的她找来在西班牙留学的藤堂静帮忙，杉菜和藤堂静发现了花泽类交给道明寺的“秘密信函”，信中花泽类希望道明寺能在那座教堂里跟杉菜求婚，替他完成和藤堂静未能实现的传说，杉菜和藤堂静读完信后各自感伤。此时，F3亦从台湾赶来巴塞隆纳。谁知又冒出一个苞谷，其经历更加曲折离奇，更证明了香荽当初念念不忘的小兄弟是如何聪慧。很快，唐伯虎终于有了离家的理由。