En iso 11125 - 6 preparation of steel substrates before application of paints and related products . test methods for metallic blast - cleaning abrasives . part 6 : determination of foreign matter 涂料和相关产品应用前钢基体的预处理.金属喷砂清洗磨料的试验方法.第6部分:外来物质的测定
A smooth , lustrous , variously colored deposit , chiefly calcium carbonate , formed around a grain of sand or other foreign matter in the shells of certain mollusks and valued as a gem 珍珠在几种软体动物的贝壳中，围绕着一粒沙子或其他外来物质形成的一种光滑、有色泽、具有不同颜色且主要是碳酸钙的沉积物，被珍视为宝石
Trade and financial liberalisation have led to the globalisation of markets , which require and promote intensified interaction between people from different jurisdictions , whether as investors or consumers of goods and services 人们以投资者或产品服务消费者的身分互动接触，达成互惠互利的交易，但彼此也可能在过程中接触到一些原只存在于对方身上的外来物质。
You may think that this theory is far - fetched and only for movies , but it is conceivable , for example , that an unintentional injection of certain foreign substances in domestic animals may have caused a benign virus to mutate and become fatal when contracted by human beings 这说法不是甚么天方夜谭式的电影桥段。试想像好端端的家禽家畜，若不慎注入外来物质，便可能引致本来良性的病毒变种，人类一旦接触了便有生命危险。
