二氧化碳
èr yǎng huà tàn HSK 6

English Meaning

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📚 Example Sentences

二氧化碳排放导致全球变暖。
Èryǎnghuàtàn páifàng dǎozhì quánqiú biànnuǎn.
Carbon dioxide emissions cause global warming.
植物吸收二氧化碳并释放氧气。
Zhíwù xīshōu èryǎnghuàtàn bìng shìfàng yǎngqì.
Plants absorb carbon dioxide and release oxygen.
减少二氧化碳是环保的重要目标。
Jiǎnshǎo èryǎnghuàtàn shì huánbǎo de zhòngyào mùbiāo.
Reducing carbon dioxide is an important environmental goal.
二氧化碳是气体。
Èryǎnghuàtàn shì qìtǐ.
Carbon dioxide is a gas.
植物吸收二氧化碳。
Zhíwù xīshōu èryǎnghuàtàn.
Plants absorb carbon dioxide.

💡 Memory Tip

Break it down: 二 (two) + 氧 (oxygen) + 化 (change/compound) + 碳 (carbon) = 'two oxygens combined with carbon.' Think of it as 'two oxygens hanging out with carbon' to form CO₂. Relate it to the example sentence: plants absorb 二氧化碳 and release oxygen.

📝 Usage Notes

This is a formal, scientific term used in both written and spoken contexts, common in academic, environmental, medical, and industrial discussions. It appears in news about climate change, biology textbooks, and safety guidelines (e.g., carbon dioxide emissions). It is neutral and technical, not typically used in casual conversation unless discussing related topics.

📖 Grammar Points

As a noun, it often serves as a subject or object in sentences, e.g., '二氧化碳增加了' (Carbon dioxide has increased) or '我们呼出二氧化碳' (We exhale carbon dioxide). It can be modified by adjectives like 过多的 (excessive) or verbs like 控制 (control).

🏯 Cultural Notes

In modern Chinese culture, 二氧化碳 is frequently associated with environmental issues like global warming and air pollution, reflecting growing public awareness. It's a key term in government policies and media reports on sustainability and green technology.

🔄 Similar Words

一氧化碳 (yīyǎnghuàtàn, carbon monoxide, CO) is similar in structure but has one oxygen atom and is toxic; 碳 (tàn) refers to the element carbon alone, while 二氧化碳 specifies the compound. 碳酸 (tànsuān) means carbonic acid, related but different chemically.

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