中国新闻网网站星期三报道称，观鸟人孙敬松的这一发现是人们在黄河三角洲上首次观察到戴颈圈的天鹅。
Chinese news Web site chinanews. com. cn reported on Wednesday that birdwatcher Sun Jingsong's discovery marks the first sighting of neck-looped swans in the Yellow River Delta.
中国新闻网网站星期三报道称，观鸟人孙敬松的这一发现是人们在黄河三角洲上首次观察到戴颈圈的天鹅。
Chinese news Web site chinanews. com. cn reported on Wednesday that birdwatcher Sun Jingsong's discovery marks the first sighting of neck-looped swans in the Yellow River Delta.
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