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Dean：Hello, everyone. Today’s word is pollute. In English, pollute means to make air, water, or land dirty and not safe. A simpler way to say it is: to harm something by making it dirty. Moli, how do you understand this word in Chinese?
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茉莉：pollute 的意思是“污染”。它指的是把空气、水、土地等弄脏，导致环境变得不干净甚至不安全。英文里可以对应为“make the environment dirty” 。 这个词是什么词性，常怎么用？
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Dean：Pollute is a verb. We often use it when we talk about the environment. People can pollute water, air, or land. Now let’s learn with an example sentence. Sentence 1: Many factories pollute the river.
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茉莉：这句话的意思是：很多工厂会把污染物排进河里，让河水变脏。场景是环境问题和工业排放。 如果你觉得 factories pollute 更难理解，先把 pollute 理解成“让河水变脏”。 Dean, can you explain the feeling of this sentence in simpler English?
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Dean：It sounds serious. We blame the factories for damaging the river. It is about a real problem, not just one small mistake. Sentence 2: The smoke can pollute the air.
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茉莉：这句话的意思是：烟会让空气变脏。场景是城市里有很多烟或火灾、燃烧带来的空气污染。 这里的 pollute 还是表示“让空气不干净”，所以 smoke 是造成污染的东西。 Dean, please continue and give us Sentence 3.
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Dean：Sentence 3: Don’t throw plastic here. It will pollute the beach.
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茉莉：这句话的意思是：不要把塑料扔在这里，因为它会把海滩弄脏、造成污染。场景是日常生活中的环保提醒。 这里的 It 指代塑料，表示它会带来长期的环境问题。 接下来讲词根词缀与词源。
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Dean：Moli, what are the word roots, affixes, and etymology of pollute? Please tell us in simple A2 to B1 English.
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茉莉：我们可以把 pollute 想成“从一个拉长的声音里长出来的词”。它来自拉丁语，原本和“清洗”“弄干净”那一类的意思有点相反：古时候的拉丁词大概是 polluere，意思偏向“使……不洁”“玷污”。所以它不是凭空出现的，而是一个表示“让某物变得不干净”的动作。 再看它的形状，pollute 在英语里看起来就像一个整体动词，没有特别明显的前缀或后缀可以拆给初学者。但你可以抓住它的“拉丁出身”：之后它进入法语和中世纪英语，逐渐就固定为“污染、弄脏环境”这种更具体的用法。 同族词方面，你可以顺路记一下污染相关的家族。比如 pollution 就是名词“污染”，它是在 pollute 的基础上加了表示结果或状态的形式；还有 polluted（被污染的）和 polluting（正在污染的）这种形容词用法，也都在说同一件事：有东西把环境或物品弄脏了。它们之间的区别主要是“动词在描述动作”，pollution 更像在说“状态或结果”，而 polluted 和 polluting 更像在描述“被影响的东西或正在发生的情况”。 至于词源演化，就像一条线慢慢拉长：最早强调“使人或物变得不洁”，后来用在水、空气、土地这些更具体的对象上，于是今天我们最常说的就是“让环境变脏、变得不安全”。
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Dean：So what did this word originally mean, and how did the meaning change over time? Tell it like a small story—where did it start, and where did it arrive?
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Dean：Imagine you are at home and you smell something bad from the kitchen. You learn that someone burned oil in a wrong way. The air feels thick, and your eyes hurt. In this situation, how do we use our word pollute?
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茉莉：第一个很常用的搭配是 pollute the air。意思是“污染空气”，强调空气变脏、变得不适合呼吸。这个搭配很贴近新闻里和日常里说“空气被污染”的表达，比如烟、燃烧、厨房油烟都可以用它来描述。英语里说到结果时，通常就是“污染了什么”，直接接 the air 最自然。
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Dean：In that situation, we say: pollute the air. Example: The smoke from that fire can pollute the air.
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茉莉：这句里 smoke 作“造成污染的东西”，can pollute 表示“可能会污染”。用在日常提醒或新闻口吻都很自然，听起来也很真实。
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Dean：Now think about school. Your class is going to write a science report about rivers. You visit a place near the river and see dirty water. The teacher asks you to describe what people did. What collocation with pollute should you use here?
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茉莉：第二个搭配是 pollute the water。意思是“污染水”，常用来讲河流、湖泊、饮用水等。这个搭配的语感比较正式，适合写作和课堂报告。你会经常在环境主题的文章里看到：先说污染源，再说污染了哪种水。
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Dean：For a river report, you can say: pollute the water. Example: People dump waste, and it pollutes the water.
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茉莉：dump waste 这个表达会让句子更像真实报道。pollute the water 也更容易让听众立刻明白问题是“水被弄脏了”，而不是别的意思。
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Dean：Third scene: you are walking in a park. You see a sign that says not to leave trash. After a windy day, you notice broken plastic on the grass. Someone tells you that trash can stay for a long time and harm nature. In this kind of scene, how do we use pollute?
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茉莉：第三个搭配是 pollute the land。意思是“污染土地”。它和 pollute the water、pollute the air 一样，也是固定结构，常用在环保科普里，强调垃圾会影响土壤与地面环境。这个搭配适合描述“地面被破坏、生态被影响”的情况。
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Dean：In this case, say: pollute the land. Example: Too much trash can pollute the land.
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茉莉：这里的 too much trash 让语气更口语，也更符合“公园里看到垃圾”的真实场景。pollute the land 的画面感很强。
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Dean：Quick question for you, listeners. Imagine a news report. Which is more natural: “Smoke pollutes the air” or “Smoke pollutes the water”? Choose one, and make one short sentence like it.
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茉莉：互动题要点：先想象新闻场景里“烟”主要影响的是空气，所以你要选更自然的搭配，并用 pollute 的结构造一句话。接下来我们想了解这个词和它的近义词有什么区别，比如在表达“让环境变脏”和“造成污染”时语气会不会一样。
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Dean：What are some common synonyms of this word? How are they different in usage?
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茉莉：pollute 的常见近义词可以有：contaminate，spoil，infect，harm。我们一个一个来对比，先看第一个；不要用括号
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Dean：OK, what is the first synonym? How should I use it correctly?
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茉莉：第一个近义词是 contaminate。 pollute 更像是“让环境变脏、变得不安全”，更常用于空气、水、土地这类广泛环境；contaminate 强调“被污染后可能带来危害”，常让人联想到细菌、化学物质或有毒成分。 更适合：讲食物、饮用水、实验材料、医疗相关或“有害污染物进入系统”的场景。 例句：The water can contaminate people if they drink it. If the lab tools are not clean, they can contaminate the sample.
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Dean：Got it. What about the next synonym? How is it different?
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茉莉：第二个近义词是 spoil。 spoil 的核心更偏向“把某物弄坏、变质”，既可以是食物味道变差，也可以是某种“干净状态”被破坏。它不像 pollute 那样一定要是环境污染，也不一定强调空气、土壤。 更适合：讲食物、气味、质量变差，或用“被破坏了原本的好状态”的意思。 例句：The milk will spoil in the heat. If you do not clean it, the smell can spoil the room.
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Dean：Thanks. Now, tell us about the third synonym.
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茉莉：第三个近义词是 infect。 infect 指“使人或动物得病”，强调病原体进入身体并造成感染。它和 pollute 不同：pollute 说的是环境或物被弄脏并带来不安全；infect 说的是“感染/生病”这一结果，通常要有具体的对象是人或动物。 更适合：医疗、疾病传播、接触后生病的场景。 例句：Dirty water can infect people with diseases. If you are sick, you can infect others.
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Dean：Okay. Can you explain the fourth synonym too?
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茉莉：第四个近义词是 harm。 harm 的意思更宽泛，是“伤害、损害”。它不一定强调“弄脏”，所以它可以用于环境，但更常用于“造成不良影响”，语气也比 pollute 更不具体。 更适合：讲结果，比如健康受损、生态受损，或写更一般的因果句。 例句：Pollution can harm our health. Too much smoke can harm people’s lungs.
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Dean：And if there are no more synonyms, can you summarize when to use which word?
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茉莉：总结一下： 如果你想说“让空气、水、土地变脏并不安全”，用 pollute；如果强调“有害物质进入并可能造成健康风险”，用 contaminate；如果强调“食物或状态变质变坏”，用 spoil；如果强调“让人或动物生病”，用 infect；如果只想表达“带来损害/不良影响”但不想太具体，用 harm。 最后一部分我们来轻松一下，讲个和这个词相关的幽默小故事；不要用括号
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Dean：We have learned so much. Now let’s relax with a fun short story related to pollute.
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茉莉：什么故事？
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Dean：Last week at school, I was in a group project. We had to make a poster about the environment. My friend Max said, “I can be the artist!” So he drew a river. Then he wrote, “People dump trash, and it pollutes the water.” Everyone nodded. It sounded perfect. Then Max smiled and said, “Now I will add smoke too.” He took a marker and made “smoke” above the river… but the marker was not new. It was leaking!
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茉莉：哎呀，马克笔漏墨了？那也太像真的污染了！他之后怎么处理？
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Dean：He tried to clean it with a tissue. But the ink spread more. Our classroom windows were open, so the smell went everywhere. I said, “Max, stop! Don’t just wipe it fast. It can pollute the air.” Max said, “Okay, okay!” Then he used the wrong trash bin. The tissue went on the floor near the door. My teacher looked at the mess and said, “Now you also pollute the land.” Max whispered, “So the poster is finally real…”
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茉莉：哈哈！这个故事太有画面感了。总结一下：pollute 可以用在 pollute the water，pollute the air，pollute the land。关键是看你想说污染的是“水、空气还是土地”。而且故事里不是学名词，是用在真实场景里就懂了！
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Dean：Great job today. We learned pollute as a verb, and we practiced common patterns for air, water, and land. Remember: keep things clean, or your “poster” might become a real mess. Thanks for listening, and see you next time. Stay cheerful!
