标签：Jets 相关文章
By Mil Arcega Washington 09 April 2007 Watch Boeing Fuel Efficient Jets Boeing 787, Fuel Efficient Jets After years of lagging behind European rival Airbus, Boeing says 2007 is shaping up to be a very good year. The Chicago based airplane manufacture
发表于:2019-01-16 / 阅读(132) / 评论(0)
2007年VOA标准英语（四月）
2007年VOA标准英语（四月）
The glowing region is the accretion disc, star debris falling inward, would turn round in the maelstrom heated by frictions to such high temperatures that it glows white hot. So at the center of our galaxy, we do have a black hole. We now know that t
发表于:2019-01-22 / 阅读(48) / 评论(0)
自然百科2011年
自然百科2011年