| 单词 | 臭氧浓度 |
| 例句 | DEFINITIVE EXAMPLES 权威例句〔observe〕Scientists have observed a drop in ozone levels over the Antarctic.科学家已经观察到南极洲上方的臭氧浓度下降了。朗文当代〔press〕Press reports revealed that ozone levels in the upper atmosphere fell during the past month.新闻报道透露上层大气的臭氧浓度在上个月有所下降。柯林斯高阶 |
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