单词：the mesosphere
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By Paul Sisco Washington 20 April 2007 NASA is preparing to launch a mission to the mesosphere, a region at the top of Earth's atmosphere where mysterious night shining clouds are formed. Little is known about the mesosphere, but its unique ice clou
发表于:2019-01-12 / 阅读(242) / 评论(0)
2007年VOA标准英语（四月）
2007年VOA标准英语（四月）