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上环野生动物, 给鸟的腿上带上编号的环来记录鸟的移动。上环是一种非常普遍的用来跟踪鸟行踪的方法，并能提供鸟的年龄信息。但它也会给鸟带来压力。 shànghuán
environ.	تثبيت حلقة في رجل طائر

上环: 13 phrases in 1 subject

United Nations

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