必须对这些鸟称重,辨识雌雄并挂上标牌。The birds must be weighed, sexed and tagged.你怎样辨别一条鱼的雌雄?How can you tell what sex a fish is?鸟的雌雄通常可就其颜色予以区分.Coloring differentiates the sexes in many birds....
multiple copies of documents各种文件的大量的副本The Windows allows a computer user to execute multiple programs simultaneously.Windows操作系统允许计算机用户同时运行多个程序.The Windows allow a computer user to execute multiple programs simultaneousl...