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为什么人会患上感冒？

感冒是由呼吸道病毒引起的传染病。当我们暴露在感冒病毒中时，我们的免疫系统会开始对抗这些病毒。然而，我们的免疫系统不一定总能够有效地消灭感冒病毒，尤其当我们的免疫系统较弱时，病毒就有可能成功入侵我们的身体，导致感冒的发生。此外，接触到被感冒病毒污染的物体或空气也是感冒传播的途径之一。

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