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In everyday language, 气体 (qìtǐ) is used to refer to "gas" in a variety of contexts. For example, it can be used to refer to the gases that are released from burning fossil fuels, such as 汽油 (qìyóu) or 煤 (méi). It can also be used to refer to the gases that are used in industrial processes, such as 氧气 (yǎngqì) or 氮气 (dànqì). Additionally, it can be used to refer to the gases that are used in medical treatments, such as 氦气 (hàiqì) or 氩气 (yàqì).
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