控制城市交通污染，必须严格控制机动车的排放。
Control of urban traffic pollution the motor vehicle emission should be controlled.
城市交通污染产生的根源在于城市交通的负外部效应。
The external negative effects of urban traffic is the root cause for urban traffic pollution.
城市交通污染已经上升为我国城市大气和噪声污染的主要污染源之一。
Urban traffic pollution has risen to one of the major sources of China's urban air and noise pollution.
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