单词：osmium-iridium (osmiridium)
锇铱矿
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The K-T boundary marks the end of the age of dinosaurs, and the beginning of the age of mammals. KT界限层标志着恐龙时代的终点和哺乳动物时代的开端。 But does the K-T boundary really signify the absolute end of all dinosaurs? 不过
发表于:2018-12-28 / 阅读(155) / 评论(0)
侏罗纪搏击俱乐部
侏罗纪搏击俱乐部
US Company Developing Space-Based Plane Tracking 美国公司开发太空基地飞机追踪技术 LEESBURG, VA One of the reasons Malaysia Airlines flight MH370 hasn't been found is because the plane couldn't be tracked continuously over the ocean. I
发表于:2019-01-14 / 阅读(152) / 评论(0)
VOA标准英语2015年(八月)
VOA标准英语2015年(八月)
A radioactive source which went missing four days ago has been found on Saturday evening. An Iridium 192 source, which was used to inspect a Sinopec industrial device in Nanjing by a testing company, had gone missing on Wednesday. Ten people in the s
发表于:2019-02-08 / 阅读(187) / 评论(0)
CCTV9英语新闻2014年05月
CCTV9英语新闻2014年05月