这种病令人惊讶的难以患上，因为大多数人对它有一种先天的免疫力。
This disease is surprisingly difficult to catch, as most people have a natural resistance to it.
人体的免疫功能分为先天和后天(获得)免疫。
Immune function is divided into natural immune and acquired immune.
人体的免疫功能分为先天和后天(获得)免疫。
Immune function is divided into natural immune and acquired immune.
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