Now, certain countries are looking to race to the moon.

现在，一些国家期待登上月球。

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HIV and malaria are only in certain countries, hepatitis is everywhere.

艾滋病毒和疟疾仅发生在部分国家，而肝炎却无处不在。

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Some things work better in certain countries and it depends on the country.

一些策略在某些市场有效，这主要取决于所在的国家。

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"Our two countries continue to disagree on certain issues, such as Georgia,and we addressed those differences candidly."

VOA: standard.2010.06.24

It's only endemic, that means only naturally occurring in certain countries.

这是种地方性疾病,这意味着仅在几个特定国家中发病

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why some countries have chosen or established certain forms of government,

为什么有些国家选择或建立某些形式的政府，

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However, certain countries - such as Spain - have youth unemployment levels of more than 40%.

BBC: MEPs raise concerns over youth unemployment

So at least one company has had to block readers in certain countries from reading certain pages.

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He added that his company often had to make "heroic endeavours" to get things done in certain countries.

BBC: Davos 2013: Africa must 'boost infrastructure spending'