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双语：古特雷斯秘书长2020年保护臭氧层国际日致辞
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双语：古特雷斯秘书长2019年保护臭氧层国际日致辞
Message by UN SG António Guterres on the International Day for the Preservation of the Ozo...
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双语：古特雷斯秘书长2018年保护臭氧层国际日致辞
Message by UN SG António Guterres on the International Day for the Preservation of the Ozo...