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....
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...