co2的音標是[k?? ? sek???]；基本翻譯是二氧化碳；速記技巧是：看到co2，想到可樂（coke），二氧化碳溶于水，噴泉（spout）噴出來。

CO?的英文詞源：

CO?是carbon dioxide的縮寫，意為二氧化碳。二氧化碳這個詞源于拉丁詞源carbon，意為碳。它是一種無色、無味、不易燃燒的氣體，在常溫常壓下為氣體。

變化形式：

二氧化碳可以是固態的干冰，也可以是氣態的。它的化學性質非?；顫?，可以和許多物質發生反應。

相關單詞：

1. carbon：碳 - 指碳元素，是構成二氧化碳的基本元素。

2. oxide：氧化物 - 二氧化碳是一種氧化物，是由氧元素和另一種元素組成的化合物。

3. combustion：燃燒 - 二氧化碳在燃燒過程中可以產生。

4. respiration：呼吸 - 人類和許多其他生物通過呼吸過程可以產生二氧化碳。

5. carbon dioxide sensor：二氧化碳傳感器 - 用于檢測環境中二氧化碳濃度的儀器。

6. carbon dioxide release：二氧化碳排放 - 指人類活動產生的二氧化碳排放量。

7. carbon dioxide capture and storage：二氧化碳捕獲和儲存 - 一種減少二氧化碳排放的技術，包括捕獲工業或能源生產過程中產生的二氧化碳，并將其儲存起來。

8. carbon dioxide injection：二氧化碳注入 - 一種地質碳捕獲和儲存技術，將二氧化碳注入地下巖石和土壤中，以減緩全球變暖的影響。

9. carbon dioxide sequestration：二氧化碳螯合 - 指將二氧化碳與土壤、水或巖石等自然體系結物結合，以減緩其在大氣中的濃度。

10. carbon dioxide reduction：二氧化碳還原 - 指將大氣中的二氧化碳還原為含碳化合物或固態碳的過程和方法。

總之，CO?是一種重要的氣體，它在化學、生物學、環境科學等多個領域都有廣泛的應用和影響。

常用短語：

1. carbon dioxide (CO2) emissions

2. carbon dioxide capture

3. carbon dioxide injection

4. carbon dioxide sequestration

5. carbon dioxide reduction

6. carbon dioxide utilization

7. carbon dioxide emissions reduction

例句：

1. We must reduce our carbon dioxide emissions to protect the environment.

2. The company is investing in new technology to capture carbon dioxide from the exhaust gas.

3. The injection of carbon dioxide into the ground helps to stimulate the production of oil and gas.

4. The government is committed to the sequestration of carbon dioxide from power plants.

5. Our company"s goal is to reduce carbon dioxide emissions by 20% by 2020.

6. Carbon dioxide utilization could be a key solution for reducing greenhouse gas emissions.

7. We must take action now to reduce the impact of climate change, including reducing carbon dioxide emissions.

英文小作文：

Carbon Dioxide and Its Impact on the Environment

Carbon dioxide is a greenhouse gas that contributes to climate change and global warming. It is emitted into the atmosphere through various sources, such as fossil fuel combustion and deforestation. As a result, we are facing increasingly severe weather patterns and environmental challenges.

One way to mitigate the impact of carbon dioxide is to reduce its emissions through various measures, such as using renewable energy sources, implementing energy-efficient technologies, and planting more trees to absorb carbon dioxide. Additionally, carbon dioxide utilization could be a key solution for reducing greenhouse gas emissions, as it can be used for various purposes, such as enhanced oil recovery and industrial processes.

Ultimately, we must work together to protect our environment and ensure a sustainable future for future generations. Reducing carbon dioxide emissions and promoting sustainable practices are essential steps towards a healthier planet.