标签：Spacewalks 相关文章
Floating free in the hostile vacuum of space, astronauts push the boundaries of exploration. Join them on an incredible journey as spacecraft Voyager explores the solar system. From planetary orbit, the earth and heavens look serene. But the vacuum
发表于:2018-12-30 / 阅读(53) / 评论(0)
国家地理2008年
国家地理2008年
It's morning in the Kalahari, and this female cheetah has discovered that her cubs are growing ever more independent. She calls for them, but theyve already gone out exploring. And theyve discovered a wounded gemsbok that may have escaped from a lion
发表于:2019-01-22 / 阅读(192) / 评论(0)
自然百科2008年
自然百科2008年
By Brian Wagner Miami 07 November 2007 The crew of the space shuttle Discovery has returned to Earth after completing a more than two-week mission to the International Space Station. VOA's Brian Wagner reports that the astronauts performed crucial co
发表于:2019-02-04 / 阅读(60) / 评论(0)
VOA常速英语2007年（十一月）
VOA常速英语2007年（十一月）