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Observer mode: pay attention to encapsulating object notification, support the change of communication object, realize the change of object state, notify and update the objects that depend on it.秦淼见板栗如此鼓励她，急忙点头，心下舒畅了好些，跟着又把目光投向葫芦。该剧集利用粉丝写给名人的信件，回顾这些极具影响力的人的生活。Editor's Note: This article comes from WeChat public number "Operation Dog Work Diary". The author is Han Xu, who is the product operation director of Netease News and author of "Super Operation Technology". 36 Krypton is authorize to be issued.Based on BIM technology, it can dynamically display the installation of important parts in advance and provide virtual reality information for construction scheme discussion and technical exchange. Subway construction may have an impact on the surrounding buildings. BIM technology can simulate the impact of subway construction on the surrounding buildings. Combined with reinforcement technology, it can judge whether the arrangement between various components is reasonable, control the construction progress, carry out comprehensive quality inspection and observation on the construction, dynamically simulate the change trend, and put forward improvement measures.故事发生在并不遥远的未来，人类在寻找替代燃料的时候偶然发现了一种叫做「三尖树」（三叶草、三脚树）的植物。这种能够提供燃料的植物似乎拥有生命－－它们会自主思考。人们没有意识到厄运将临，心安理得地将它们种植在自己身边。一天，当全世界人民都在观测一场千年难遇的太阳风暴时，突如其来的意外让数十亿人瞬间失明。尽管有少数人幸免于难，但由瞎子构成的人类社会很快陷入一片混乱。斗战胜佛，就这样死了？杨舟喃喃自语，不敢相信。