氧 (yǎng): oxygen (chemistry)

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noun

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一种化学元素，符号为O，是空气的主要成分之一，约占空气体积的五分之一。常温下是无色无味的气体，能支持燃烧，也是人和动物呼吸、植物生长所必需的物质。通常说“氧气”，用于医疗、工业、潜水等场合。

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When climbers reach an altitude above 7,000 meters, they often need to carry oxygen tanks because the oxygen there is too thin.

The doctor put an oxygen mask on the patient to help him breathe more smoothly.

Green plants absorb carbon dioxide and release oxygen in the sunlight, which greatly helps improve air quality.

In the laboratory, the teacher reminded the students not to put flammable materials near pure oxygen to avoid danger.

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