单词：boron tetrachloride
四氯化二硼
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New Report Shares Secrets of Rare Blue Diamonds History The Hope Diamond is one of the worlds most famous jewels. It was in the possession of a series of people: kings, bankers, rich women and thieves, before its arrival 60 years ago at the Smithsoni
发表于:2019-01-03 / 阅读(97) / 评论(0)
2018年VOA慢速英语(八)月
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