| 单词 | ozone concentration |
| 例句 | DEFINITIVE EXAMPLES 权威例句〔concentration〕Global ozone concentrations have dropped over the last decade.过去的十年里, 全球臭氧密度降低了。外研社新世纪〔concentration〕The latest data showed that global ozone concentrations had dropped several per cent over the last decade.最新数据显示，过去10年来全球臭氧的浓度降低了几个百分点。柯林斯高阶 |
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