Considering that only thirty whooper swans were marked this year in Mongolia as a small pilot project, observations of 9 birds in their wintering sites so soon is astonishing!

• 作为一次规模较小的实验性项目，鉴于今年在蒙古仅为30只大天鹅做了标记，这么快在它们的越冬地观察到9只天鹅是令人感到惊奇的！