已经发现至少有一种禽病的病原体。

At least one avian disease pathogen has been found.

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我不知道这种禽流感是否会蔓延。

I wonder if this kind of bird flu will spread.

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检验结果显示这些鸡死于一种禽流感。

Tests revealed they had died of a form of bird flu.

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检验结果显示这些鸡死于一种禽流感。

Tests revealed they had died of a form of bird flu.

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