As in Asia, contact with infected birds is the principal source of infection.

如同在亚洲一样，接触受感染的禽鸟是主要感染源。

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Those glaciers are the source of most of the major rivers in Asia.

这些冰川是亚洲大部份大河的源头。

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Those glaciers are the source of most of the major rivers in Asia.

这些冰川是亚洲大部份大河的源头。

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