The live-attenuated vaccine is considered the most effective, but there is a worry: what might happen once these viruses wake up?

减毒活疫苗被认为是最有效的，但有一个问题：一旦这些病毒苏醒，会发生什么？

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That is a worry for the future.

这是以后要担心的事。

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Europe is even more of a worry.

欧洲区就更令人担忧了。

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Now there is worry about a new threat headed in their direction in the wind a fungus that destroys wheat crops.

VOA: special.2009.08.18

Her statement points to a persistent worry, and it's a worry that exists even now in the twentieth century about the nature of Milton's power.

她的陈述不断透露着忧虑，这种忧虑一直持续到现在20世纪,关于弥尔顿之力量的本性的忧虑。

耶鲁公开课 - 弥尔顿课程节选

Now, underlying the libertarian's case for the minimal state is a worry about coercion, but what's wrong with coercion?

在自由主义者的“小政府“概念中,隐含着对强迫的担忧，强迫有什么问题呢？

耶鲁公开课 - 公正课程节选

But it also seems to reflect a worry about falling too deeply under his own spell.

NEWYORKER: The Visionary

"At the moment it's not a worry because we're not back until Friday, " he said.

BBC: Cardiff cross fingers over Parry

That is a worry, because investors' appetite for these securities fuelled the boom in riskier mortgages.

ECONOMIST: America's housing market