第1个回答 2017-12-14
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Defence War for the Blue Sky
第2个回答 2017-12-14
a battle against air pollution
第3个回答 2017-12-14
蓝天保卫战
The war to dispell haze for blue sky;
the war against haze for blue sky;
the war for more blue-sky days
第4个回答 2017-12-14
making our skies blue again