The rise in global surface air temperature;

全球地表气温上升;

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On the surface, air quality monitoring can seem merely reactive.

表面上看，空气质量监测似乎只是一种反应式措施。

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Would you like this sent surface, air or express mail?

您要我用平寄、空运还是快递？

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Would you like this sent surface, air or express mail?

您要我用平寄、空运还是快递？

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