上一片的抗体导弹已经就位——可战场在哪里？伤口为什么又红又肿、又热又痛？别误会，那不是坏事，是求援信号。Last leaf's antibody missiles are ready — but where is the battle? Why does a wound turn red, swollen, hot and sore? Don't panic: that's not disaster, it's a distress signal.
第 1 步：受伤现场，血管先调兵Step 1: At the wound, vessels call in troops first
一不小心擦伤了，身体里面最先发生什么？You scrape your knee — what happens inside first?
第一步，血管扩张、血流加大；第二步，血管壁变松，液体渗进组织；第三步，白细胞从血管里钻出来，向伤口爬去。援军和物资，全在往战场赶。First, vessels widen and blood flow surges; then vessel walls loosen and fluid leaks into the tissue; finally, white cells squeeze out of the vessels and crawl toward the wound. Troops and supplies are all heading to the battle.
这场大增援，会在外面留下四个看得见的痕迹。This big rescue operation leaves four visible traces outside.
第 2 步：红肿热痛，各有一份解释Step 2: Red, swollen, hot, painful — each has a reason
红＝血管扩张、血变多；肿＝渗出的液体堆在组织里；热＝代谢加快、产热变多；痛＝肿胀压迫神经、报警物质在提醒你。四个表现，全是增援部队留下的痕迹。Red = widened vessels carrying more blood; swollen = leaked fluid piling up; hot = faster metabolism releasing heat; painful = swelling pressing nerves, alarm chemicals reminding you. All four are traces of the rescue effort.
既然是警报，它要响多久？一直发炎行不行？If it's an alarm, how long should it ring? Is it fine to stay inflamed?
第 3 步：警报该响多久，为什么多休息Step 3: How long the alarm rings — and why rest helps
炎症像战场警报：探照灯照亮出事点，增援部队沿扩张的“大道”赶来。急性炎症响得亮、退得快，是朋友；慢性炎症一烧几个月甚至几年，反而伤到自己。所以发炎时要休息——别打扰正在赶来的增援。Inflammation works like a battlefield alarm: a beacon marks the spot while reinforcements rush in along the widened “highway”. Acute inflammation is loud but short — a friend. The chronic kind smolders for months or even years and starts to harm you. So rest when inflamed — don't disturb the rescue.
🎮 走进伤口现场（30 秒）🎮 Your turn: step into the wound scene (30 seconds)
一帧一帧看完这场增援大戏，再用 4 道题解释红肿热痛各从哪来。Watch the rescue drama frame by frame, then explain where redness, swelling, heat and pain each come from.
一句话记住它：炎症 = 受伤现场发出的求援信号：红肿热痛四大表现，全是“血管扩张 + 免疫增援”的痕迹；发炎时，休息就是最好的支援。Remember it in one line: inflammation is the wounded area calling for help — red, swollen, hot and painful are all traces of “wider vessels + immune reinforcements”; when inflamed, resting is the best support.
血管扩张送兵、液体渗出送物资——红和肿是增援的痕迹Vessels widen to send troops, fluid leaks in as supplies — red and swollen are traces of rescue热来自代谢加快；痛是神经在提醒你“别乱动”Heat means faster metabolism; pain is your nerve saying “don't move it”急性炎症是朋友；拖成几个月的慢性炎症才要当心Acute inflammation is a friend; a chronic one smoldering for months needs care
内容参考 OpenStax 等公开教材，多来源核对 · AI 生成、人工审核 · 发现错误欢迎指正，帮这片叶子长得更好。Based on OpenStax and other open textbooks, cross-checked across sources · AI-generated, human-reviewed · Spotted a mistake? Tell us — help this leaf grow.
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