Pairs such as rings and slotted rings, the origin of this phase is the jade, which is convincing and representative of some class, jade, decorated jade culture, or from the origin.
成对的像环、玦，这样的才是玉器起源阶段，这也是有说服力的和有代表性的一些器类，玉文化还是从装饰玉器起源的。
Each student should introduce his or her article, summarizing it and reading one or two representative paragraphs to the class. Presentations should be about 3-5 minutes.
每个学生都要介绍自己的文章，扼要说明并且为全班朗读一到两段具代表性的段落。报告应该是3 - 5分钟。
Each student should introduce his or her article, summarizing it and reading one or two representative paragraphs to the class. Presentations should be about 3-5 minutes.
每个学生都要介绍自己的文章，扼要说明并且为全班朗读一到两段具代表性的段落。报告应该是3 - 5分钟。
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