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These things, in fact, are not difficult, but they are abstract and not easy to understand as a whole. It is suggested that readers: according to the relationship diagram, build a new project, write their own code (or refer to my code), and go through it according to the general idea, so as to understand its thoughts and understand it easily!Open the section "Definition and Classification of Gems" under the section "Overview of Gem Processing and Materials", Only in the video, associate professor Liao wangchun of the jewelry department of Jinling institute of science and technology explained: there are 45 varieties of natural gemstones, 32 varieties of natural jade, 9 kinds of available and national standard named organic gemstones, and the most important types of artificial gemstones are synthetic gemstones, artificial gemstones, pieced gemstones and recycled gemstones...Further: The factory method is used to process the creation of objects and delay the implementation of this creation of objects to subclasses, so that the code about the base class in the customer code is decoupled from the subclass object creation code.Guo Donglin Spokesman: 800,000 RMB for Two Years (Plane) Li Lingyu Spokesman: 700,000 RMB Every Two Years那是很久以前的事了。那个时候，还没有冥界，天柱连接着天和大地，天空不像现在的天空，那时候的天，悬在云端里。在后世的记载中，它还有一个名字，叫做“昆仑”。人类，是神创造的，世间一切，都是神的子民。昆仑山的天女来到了人间。天女，是神的使者。然而在人类中，出现了一种疾病，那是一种令人丧失心智的疾病，那就是...清军主力入关后，大清王朝定都北京。经过明末清初的战火摧残，华夏大地急需太平安宁。但就在顺治十八年，恶疾天花袭击皇宫，皇帝爱妃命丧黄泉，顺治皇帝痛不欲生，决意遁入空门。危急之际，孝庄太后力挽狂澜，下令改朱批，行蓝批，同时立下诏书：清顺治十八年正月初七，顺治皇帝龙御归天。公元1661年，在孝庄太后的扶植下，天花大病初愈、年仅八岁的爱新觉罗·玄烨登上了大清皇帝的龙座，称康熙皇帝。翌年改元康熙。