除其他弱点外，城市在独自应对空气污染时而必须采取的措施存在政治上的争议，因此也很易受到攻击。
Among other weaknesses, the measures cities must employ when left to tackle dirty air on their own are politically contentious, and therefore vulnerable.
除其他弱点外，城市在独自应对空气污染时而必须采取的措施存在政治上的争议，因此也很易受到攻击。
Among other weaknesses, the measures cities must employ when left to tackle dirty air on their own are politically contentious, and therefore vulnerable.
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