chòu​yǎng​dòng

ozone hole

臭氧洞 chòu​yǎng​dòng
ozone hole noun
A region of the atmosphere where the concentration of ozone is significantly reduced, allowing harmful ultraviolet radiation to reach the Earth's surface; short for 臭氧层空洞 chòu​yǎng​céng​kōng​dòng

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