亚洲、北美和南美的鸟类，在气候变暖的若干年里，其感染率的变化较小，而生活在非洲和欧洲的鸟类则受影响较大。
Birds in Asia, North America and South America suffered much less change in their levels of infection during warm years than did birds dwelling in Africa and Europe.
亚洲、北美和南美的鸟类，在气候变暖的若干年里，其感染率的变化较小，而生活在非洲和欧洲的鸟类则受影响较大。
Birds in Asia, North America and South America suffered much less change in their levels of infection during warm years than did birds dwelling in Africa and Europe.
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