护照过期是无效的.A passport that is out of date is invalid.今天宇航员将会做最后一次尝试，力图把一颗通信卫星从无效的轨道上抢救下来。Astronauts will make a final attempt today to rescue a communications satellite from its useless orbit.此外，他们还声称任何这样的干预都是完全无效的。Further...
Altaic language spoken by the Korean people.韩国人说的阿尔泰语.The use of Uzbek language belongs to Altaic Turkic language branch, West Huns.使用乌孜别克语,属阿尔泰语系突厥语族西匈奴语支.Altaistic provides a set of methods and theories for the researc...