Progesterone acts as an antiinflammatory agent and regulates the immune response.

孕酮作为抗炎药，调节免疫反应。

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An over-reactive immune system is also the cause of allergies, where a harmless agent (such as pollen) can lead to an unnecessary immune response.

过激的免疫系统也是引起过敏的原因，本来无害的物质(如花粉)会引起不必要的免疫反应。

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When injected into humans, the agent itself or its protein subunits, will elicit a strong immune response, which will be protective against further infection from that agent.

当注入人体时，介质本身或其蛋白质亚基会引发很强的免疫反应从而避免对同种介质的进一步感染。

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Usually it's done by taking all or part of the infectious agent, and showing them to your immune system in some way.

通常它会带着全部或部分抗原介质,并以某种方式呈递给你的免疫系统

耶鲁公开课 - 生物医学工程探索课程节选