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The proper way to use 臭氧层 (chòu yǎng céng) in a sentence is to refer to it as the layer of the Earth's atmosphere that contains a high concentration of ozone gas.
Example: 科学家们发现，由于人类活动导致的空气污染，臭氧层正在逐渐变薄。(Kēxuéjiāmen fāxiàn, yóuyú rénlèi huódòng dǎozhì de kōngqì wūrǎn, chòu yǎng céng zhèngzài zhújiàn biàn báo. Scientists have discovered that due to air pollution caused by human activities, the ozone layer is gradually thinning.)
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