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。

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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。

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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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That is what makes A Plan for Action especially interesting, and especially worrisome.

CENTERFORSECURITYPOLICY: The coming war on sovereignty

The display performance was especially worrisome, with the total volume of ads sold falling 7% year over year and the price per ad dropping 2%.

FORBES: Yahoo Earnings: Marissa Mayer's Got Numbers -- Just Not the Right Ones

Especially worrisome to supporters of missile defense is the prospect that such a review and negotiations may be conducted by people who have, heretofore at least, evinced little enthusiasm for actually deploying a U.S. anti-missile system.

CENTERFORSECURITYPOLICY: Deploy Missile Defenses Now