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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Valentine's day is only celebrated on February the 14th in certain countries.

在有的国度，情人节只在2月14日庆祝。

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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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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.

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It said it would be looking at the resolution of "possible accounting, control and compliance issues...in certain countries".

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