💧 水污染：清澈河流的“生病”💧 Water Pollution: When the Clear River Falls Sick
上一片治天上的烟，这一片看地上的水：蓝色星球向导划船来到蓝星镇的小河——水面泛绿，鱼儿翻白，小河“生病”了。Last leaf we treated the sky; now look at the water: our blue-planet guide rows onto Blue Planet Town's little river — green surface, fish gasping. The river has “fallen sick”.
第 1 步：小河的病症Step 1: The river's symptoms
先看病症：水变绿、鱼缺氧，问题出在水里的氧气上。Symptoms first: green water, gasping fish — the trouble is the oxygen in the water.
健康的河清澈见底，鱼虾快活；生病的河铺满绿藻，鱼探头喘气。鱼靠水里的溶解氧呼吸——藻一疯长，氧就被抢光，鱼只能浮头“求氧”。A healthy river runs clear, fish darting happily; a sick one wears a green algae blanket while fish gasp at the surface. Fish breathe dissolved oxygen in water — when algae explode, the oxygen gets stolen and fish must surface to “beg for air”.
好好的河，为什么会长满绿藻？凶手就藏在岸上。Why would a fine river grow an algae blanket? The culprits hide on the banks.
第 2 步：揪出四个凶手Step 2: Catch the four culprits
一号工厂废水又黑又臭，二号农田化肥水是藻类的“大餐”（这叫富营养化），三号生活污水又脏又油，四号塑料微粒最小却最阴：小鱼误食，大鱼吃小鱼，毒素一路往上积。No.1 factory wastewater, black and smelly; No.2 farm fertilizer runoff — a feast for algae (that's eutrophication); No.3 household sewage, greasy and dirty; No.4 microplastics, tiniest but sneakiest: small fish swallow them, big fish eat the small fish, and the poison piles up the chain.
凶手找到了，小河还有救：送它去“医院”洗个澡。Culprits caught — and the river can still be saved: send it to the “hospital” for a wash.
第 3 步：污水处理厂救小河Step 3: The cleanup plant saves the river
脏水过四站，一站比一站清：格栅拦大垃圾，沉淀让泥沙下沉，生化请微生物吃脏东西，消毒杀死病菌。出水清了，溶解氧回来，鱼也回来了。Dirty water passes four stations, cleaner each time: screens catch big trash, settling sinks the mud, bio-cleaning lets microbes munch the dirt, disinfection kills germs. Out flows clear water — dissolved oxygen returns, and so do the fish.
🎮 你来当厂长（30 秒）🎮 Your turn: plant manager (30 seconds)
道理讲完了。先按正确顺序点亮 4 站，看浑浊度一路下降；再接 3 个排查任务，揪出污染源。Theory done. First light up the 4 stations in the right order and watch the cloudiness fall; then take 3 missions to catch the polluters.
一句话记住它：水污染 = 凶手（工业/化肥/生活/微粒）＋ 富营养化抢氧；四站处理（格栅→沉淀→生化→消毒）让小河变清。Remember it in one line: water pollution = culprits (industry / fertilizer / sewage / microplastics) + eutrophication stealing oxygen; four stations (screen → settle → bio-clean → disinfect) bring the clear river back.
病症：绿藻爆发、鱼缺氧——水里溶解氧被抢光Symptoms: algae bloom, gasping fish — dissolved oxygen stolen凶手：工业废水、化肥水、生活污水、塑料微粒（食物链富集）Culprits: factory waste, fertilizer runoff, sewage, microplastics (piling up the food chain)救治：格栅 → 沉淀 → 生化 → 消毒，一站比一站清Cure: screen → settle → bio-clean → disinfect, cleaner at every stop
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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