Those results are especially worrisome, flu experts say, because pigs are believed to be mixing vessels in which avian and human flu viruses can combine into new strains.
流感专家说，那些结果非常令人不安，因为猪被认为是一种混合载体，在那里禽流感和人类流感病毒可能会结合形成新的病毒株。
That’s worrisome, especially in the United States, where dams are rapidly aging, according to some researchers.
研究人员称，这十分令人担忧，尤其是在美国，那里的大坝正迅速老龄化。
Any flu epidemic is worrisome, especially when a new strain of flu bug is involved.
任何流感大流行都令人不安，特别是当一种新型毒株介入的时候。
Any flu epidemic is worrisome, especially when a new strain of flu bug is involved.
任何流感大流行都令人不安，特别是当一种新型毒株介入的时候。
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