It's easy to spread germs that cause colds, flu and other illnesses.

这个季节很容易传播细菌，引起感冒、流感和其它疾病。

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That's because the viruses that cause colds and other respiratory infections thrive at cool temperatures.

这是因为引起感冒和其他肺部感染的病毒在低温下繁殖得更快。

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Then, after four days, their left ears were infected with an adenovirus (one of the sorts of virus that cause colds).

四天以后，另一只不聋的耳朵也被一种腺病毒所感染(引起感冒的一种病毒)。

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Adenoviruses are viruses that give upper respiratory infections, they cause colds.

腺病毒可以感染上呼吸道,引起感冒

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Usually, viruses cause colds by attaching themselves to proteins that in turn connect to nasal cells.

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Coronaviruses, which are common around the world, often cause colds.

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