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该系列的中心是印第安纳州的一个非裔工人阶级家庭，他们在没有任何蓝图的情况下，努力使之正常运转。Public Original (String value) {船舱里漆黑一片，啥也看不见。本剧的制片人Steve Levitan及Christopher Lloyd将带我们看看当代美国家庭的嬉笑怒骂，捧腹一刻，也许你能从中找到自家的影子。Let's look directly at the code:Open the course of "Gem Processing Technology", It is found that it is based on "Gem Processing Technology" written by Professor Liu Ziqiang of Jewelry Department of Jinling Institute of Science and Technology. Including six aspects of knowledge-a preliminary understanding of some gemstone raw materials, Understand the names, characteristics and development history of different gemstone cut styles, understand some basic equipment and accessories for gemstone processing, understand the processing principles and technological methods of gemstones, see the processing process of standard round polyhedral styles, and learn the processing quality evaluation of gemstones (including jadeite).