For an underground urban freeway is in an enclosed space, pollution from vehicle emissions can be collectively filtered and disposed with high-technical method.
城市地下快速路处在一个封闭的环境中，机动车尾气可通过高技术措施进行集中过滤和处理。
For an underground urban freeway is in an enclosed space, pollution from vehicle emissions can be collectively filtered and disposed with high-technical method.
城市地下快速路处在一个封闭的环境中，机动车尾气可通过高技术措施进行集中过滤和处理。
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