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....
Every man has his hobbyhorse.萝卜青菜,各有所爱.Don't get him started on his hobbyhorse.不要让他又开始他的老调重弹.Now he's started on his hobbyhorse.现在他又开始老调重弹了.Every man has his hobbyhorse .萝卜青菜，各有所爱...
我们的协议是以不扩散这一重要标准为基础的.Our agreement is founded on important nonproliferation standards.核不扩散条约将面临更大的压力.The Nuclear Non - Proliferation Treaty will come under further pressure.但《核不扩散条约》 ( NPT ) 现在看来正在经受考验.But the Nuclear No...