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How Do Vaccines Train Your Immune System?
疫苗如何训练我们的免疫系统？
精读先不看文字，完整听一遍。
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Vaccines introduce harmless versions of germs—or just key parts of them—so your body can practice fighting without getting sick.疫苗引入无害的病原体或其关键成分，让身体在不生病的情况下练习防御。
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Your immune system responds by producing specialized white blood cells called B cells and T cells that recognize the invader’s unique markers.免疫系统会生成能识别病原体特有标记的B细胞和T细胞。
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Some of those cells become ‘memory cells,’ which remain in your body for years or even decades after vaccination.其中部分细胞会变成‘记忆细胞’，可在体内存留数年甚至数十年。
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If the real pathogen later enters your body, memory cells activate much faster and stronger than during the first encounter.若真实病原体日后入侵，记忆细胞的反应会比初次接触时更快、更强。
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This rapid response usually stops infection before symptoms develop—or makes illness far milder and shorter.这种快速反应通常能在症状出现前阻止感染，或使疾病更轻、更短。
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mRNA vaccines, like those used for COVID-19, deliver genetic instructions so your own cells temporarily make a harmless viral protein.mRNA疫苗（如新冠疫苗）向人体细胞提供遗传指令，使其短暂制造一种无害的病毒蛋白。
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Your immune system then learns to target that protein, just as it would during a real infection.免疫系统随即学会识别并攻击该蛋白，如同遭遇真实感染。
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Booster shots refresh memory cell numbers and improve protection, especially as immunity naturally fades over time.加强针可提升记忆细胞数量，增强保护力，尤其当免疫力随时间自然下降时。
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Vaccines don’t overload your immune system—your body deals with thousands of foreign molecules every day from food and air.疫苗不会压垮免疫系统——人体每天都会通过食物和空气接触成千上万种外来分子。
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Herd immunity emerges when enough people are protected, making it harder for diseases to spread and shielding those who can’t be vaccinated.当足够多的人获得免疫，群体免疫便形成，疾病更难传播，从而保护无法接种者。
精读 · 大约 10 分钟
听 → 读 → 学表达 → 懂 → 今天会说这一句 → 跟读录音 → 自己说一句。
③ 学 · 重点表达
- This rapid response usually stops infection before symptoms develop—or makes illness far milder and shorter. 这种快速反应通常能在症状出现前阻止感染，或使疾病更轻、更短。
- Booster shots refresh memory cell numbers and improve protection, especially as immunity naturally fades over time. 加强针可提升记忆细胞数量，增强保护力，尤其当免疫力随时间自然下降时。
- Vaccines introduce harmless versions of germs—or just key parts of them—so your body can practice fighting without getting sick. 疫苗引入无害的病原体或其关键成分，让身体在不生病的情况下练习防御。
④ 懂 · 选一选
⑤ 今天会说这一句
This rapid response usually stops infection before symptoms develop—or makes illness far milder and shorter.
⑥ 跟读并录音
This rapid response usually stops infection before symptoms develop—or makes illness far milder and shorter.
第一版：录下来、回听、再听标准音。系统打分以后再加。
⑦ 说 · 自己来一句
用今天的表达，自己说一句。
例子：This rapid response usually stops infection before symptoms develop—or makes illness far milder and shorter.
已记下。连续天数以后会显示在课表里。
陈老师指导
课程开发中，敬请期待。成人和孩子都可以先自学听读、精读。
这边的讲解音轨还在做。想先跟着老师走完固定 30 课，可以去陈老师带读社（和自学通行不是同一份会员）。
课程开发中，敬请期待。