This paper studies pyrogenation of freshwater breeding nacre and mussel, and discusses the influence of shell on the pyrogenation process of macromolecule material.
本文研究了淡水养殖珍珠贝和淡水蚌壳的热分解行为，并且探讨了贝壳对高分子材料热降解行为的影响。
The relative concentrations of carotenoid in nacre are closely associated with the color of nacre and tend to reduce gradually from posterior to umbo region in nacre of the same shell.
珍珠层中类胡萝卜素的相对浓度与珍珠层的颜色密切相关，在同一贝壳中从壳后端至壳顶，其相对浓度逐渐变小。
The nacre is known by people's attention for a long time which is one of the general construction units of mollusk shell.
珍珠层很早就引起了人们的关注，它是软体动物贝壳中普遍发育的一种结构单元。
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