风跑起来了，也捎上了水蒸气。这一片跟着小水滴去旅行：它从大海出发，最后还能回家吗？The wind is running, carrying vapor along with it. Follow one little drop: leaving the sea, can it ever come home?
第 1 步：转圈圈的四站Step 1: Four stops in a loop
先看全程：一滴水只走四站，却能无限循环。The whole trip first: one drop visits just four stops, looping forever.
太阳一晒，海水蒸发上天；水蒸气凝结成云；云变重降雨落下；雨水汇成径流流回大海。太阳是动力，水是演员，转完一圈再来一圈。Sunshine evaporates seawater skyward; vapor condenses into cloud; heavy clouds release precipitation; rain gathers into runoff flowing home to the sea. The sun powers it all — water plays every part, loop after loop.
你可能会问：落下来的雨，最后都去哪了？You might ask: where does all the fallen rain end up?
第 2 步：云雨河流全是它Step 2: Clouds, rain, rivers — all of it
天上的云是小水滴排队飞，落下的雨是它们背着降落伞跳，山间的河流是它们手拉手回家。云雨河流湖泊地下水，全是同一批水在换衣服。Clouds are little drops queuing up to fly; rain is drops parachuting down; rivers are drops holding hands on the way home. Clouds, rain, rivers, lakes, groundwater — the same water in different outfits.
那地球上的水，会越用越少吗？Will Earth's water ever run out?
第 3 步：恐龙喝过的水Step 3: Water dinosaurs drank
地球上的水总量不变，用完一圈再来一圈。你今天喝的水，恐龙可能也喝过。小水滴旅行了亿万年，从不散场，也不会离开地球。Earth's total water never changes — every loop begins again. The water you drink today may have been sipped by dinosaurs. Little drops have toured for billions of years, never leaving the show — or the planet.
🎮 你就是小水滴（30 秒）🎮 You are the little drop (30 seconds)
故事讲完了。替小水滴选对每一程的下一站，走满 4 站回到大海。Story done. Pick the right next stop for the little drop, all 4 legs home to the sea.
一句话记住它：太阳驱动水循环：蒸发上天 → 凝结成云 → 降水落下 → 径流回家。Remember it in one line: the sun drives the loop: evaporate up → condense to cloud → precipitate down → run home.
四站闭环：蒸发 → 凝结 → 降水 → 径流Four stops, one loop: evaporation → condensation → precipitation → runoff云雨河流地下水，全是同一批水在换衣服Clouds, rain, rivers, groundwater — the same water, new outfits水总量不变：你喝的水，恐龙可能也喝过Total water never changes: your sip may be a dinosaur's sip
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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