为什么生过一次某种病后，常常不容易再得？
Why are we often less likely to catch the same illness twice?
免疫系统打败病菌后会留下"记忆细胞"，下次同一种病菌再来能更快认出并消灭它。这就像身体记下了坏蛋的模样，提前做好了准备。
After defeating a germ, the immune system keeps memory cells that recognize the same germ faster next time and destroy it. It is like the body remembering a troublemaker's face and preparing early.
难度 入门 · 适合 小学高段(9-12)
CC BY 4.0 · 已核验 · Verified 2026-11-03
来源 · Source
葛均波 等主编,《内科学》第9版,人民卫生出版社,2018
Ge Junbo et al. eds., Internal Medicine, 9th ed., PMPH, 2018
独立核验依据 · Independent verification: 核验依据 1 ISBN 9787117265416（豆瓣书目条目: 内科学）
#免疫 #记忆
为什么吃饭前要去洗手？
Why should we wash hands before eating?
手上藏着看不见的小病菌，洗手用肥皂和清水能把它们冲走。干净的手能把病菌挡在嘴巴外面，少生病。
Tiny germs hide on hands, and washing with soap and water rinses them away. Clean hands keep germs out of the mouth and help you stay well.
难度 入门 · 适合 幼儿(3-6)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
Harrison's Principles of Internal Medicine 第20版,McGraw-Hill,2018
J. Loscalzo et al., Harrison's Principles of Internal Medicine, 20th ed., McGraw-Hill, 2018
独立核验依据 · Independent verification: 核验依据 2 OPENLIBRARY ISBN 标识 9781259644047（按标识回读: Harrison's prin
#洗手 #病菌
为什么感冒时鼻子会流鼻涕？
Why does the nose run when we have a cold?
鼻子里的黏膜会分泌更多清鼻涕，把进来的病菌和灰尘冲出去。流鼻涕虽然麻烦，其实是身体在帮忙打扫。
The lining inside the nose makes extra runny mucus to wash out invading germs and dust. Though annoying, a runny nose is the body helping with cleanup.
难度 入门 · 适合 小学低段(6-8)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
Harrison's Principles of Internal Medicine 第20版,McGraw-Hill,2018
J. Loscalzo et al., Harrison's Principles of Internal Medicine, 20th ed., McGraw-Hill, 2018
独立核验依据 · Independent verification: 核验依据 2 OPENLIBRARY ISBN 标识 9781259644047（按标识回读: Harrison's prin
#鼻涕 #感冒
为什么咳嗽时要捂住嘴巴？
Why should we cover our mouth when coughing?
咳嗽会把小病菌喷到空气里，捂住嘴巴或用肘部挡住，就不容易传给身边的人。这是保护朋友和家人的好礼貌。
Coughing sprays tiny germs into the air, and covering your mouth or using your elbow stops them from reaching people nearby. It is a kind way to protect friends and family.
难度 入门 · 适合 小学低段(6-8)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
Harrison's Principles of Internal Medicine 第20版,McGraw-Hill,2018
J. Loscalzo et al., Harrison's Principles of Internal Medicine, 20th ed., McGraw-Hill, 2018
独立核验依据 · Independent verification: 核验依据 2 OPENLIBRARY ISBN 标识 9781259644047（按标识回读: Harrison's prin
#咳嗽 #礼貌
为什么有时候我们会生病？
Why do we sometimes get sick?
病菌溜进身体里捣乱时，身体就会用发烧、咳嗽来赶走它们，这就是生病。等免疫系统打赢了，病就好了。
When germs sneak in and cause trouble, the body uses fever and cough to drive them out, and that is being sick. Once the immune system wins, you get better.
难度 入门 · 适合 幼儿(3-6)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
Harrison's Principles of Internal Medicine 第20版,McGraw-Hill,2018
J. Loscalzo et al., Harrison's Principles of Internal Medicine, 20th ed., McGraw-Hill, 2018
独立核验依据 · Independent verification: 核验依据 2 OPENLIBRARY ISBN 标识 9781259644047（按标识回读: Harrison's prin
#生病 #病菌
为什么我们会咳嗽和打喷嚏？
Why do we cough and sneeze?
咳嗽和打喷嚏是身体在用力把鼻子、喉咙里的病菌和灰尘往外喷。这是身体在打扫呼吸道，保护肺脏干净。
Coughing and sneezing are the body forcefully spraying germs and dust out of the nose and throat. It is the body cleaning the airways to keep the lungs clear.
难度 入门 · 适合 幼儿(3-6)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
Harrison's Principles of Internal Medicine 第20版,McGraw-Hill,2018
J. Loscalzo et al., Harrison's Principles of Internal Medicine, 20th ed., McGraw-Hill, 2018
独立核验依据 · Independent verification: 核验依据 2 OPENLIBRARY ISBN 标识 9781259644047（按标识回读: Harrison's prin
#咳嗽 #喷嚏
为什么不能和别人共用杯子和勺子？
Why shouldn't we share cups and spoons?
每个人的唾液里都有各自的细菌，共用杯子或勺子会把别人的细菌带进自己嘴里，可能传来感冒等小病。用自己的餐具既卫生，也尊重彼此的健康。
Everyone's saliva carries their own bacteria, and sharing cups or spoons moves another person's germs into your mouth, possibly spreading colds. Using your own utensils is cleaner and respects each other's health.
难度 入门 · 适合 小学高段(9-12)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
Harrison's Principles of Internal Medicine 第20版,McGraw-Hill,2018
J. Loscalzo et al., Harrison's Principles of Internal Medicine, 20th ed., McGraw-Hill, 2018
独立核验依据 · Independent verification: 核验依据 2 OPENLIBRARY ISBN 标识 9781259644047（按标识回读: Harrison's prin
#杯子 #病菌
为什么身体里有一支"防卫队"？
Why does the body have a defense team?
白细胞就像小士兵，在血液里巡逻，看见病菌就围住消灭。这支免疫队伍天天保护我们，大多时候我们都不知道。
White blood cells are like little soldiers patrolling the blood, surrounding and destroying germs they meet. This immune team protects us every day, usually without us noticing.
难度 入门 · 适合 小学低段(6-8)
CC BY 4.0 · 已核验 · Verified 2026-11-03
来源 · Source
葛均波 等主编,《内科学》第9版,人民卫生出版社,2018
Ge Junbo et al. eds., Internal Medicine, 9th ed., PMPH, 2018
独立核验依据 · Independent verification: 核验依据 1 ISBN 9787117265416（豆瓣书目条目: 内科学）
#免疫 #白细胞
为什么用肥皂洗手比只用清水更好？
Why is washing with soap better than water alone?
肥皂的分子一头抓水、一头抓油脂，能把包着病菌的油腻外壳拆开，让病菌随水冲走。光用水很难弄掉这些油腻的病菌。
Soap molecules grab both water and grease, breaking apart the oily coat that hides germs so they rinse away. Water alone struggles to remove those greasy germs.
难度 入门 · 适合 小学高段(9-12)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
Harrison's Principles of Internal Medicine 第20版,McGraw-Hill,2018
J. Loscalzo et al., Harrison's Principles of Internal Medicine, 20th ed., McGraw-Hill, 2018
独立核验依据 · Independent verification: 核验依据 2 OPENLIBRARY ISBN 标识 9781259644047（按标识回读: Harrison's prin
#肥皂 #洗手