One less car on the road means less pollution.
马路上车少也意味着污染更少。
Road traffic noise has become one of the major urban pollution sources.
交通噪声已成为城市主要污染源之一。
The arterial road in city has become one of the important city pollution sources.
城市干道已成为城市主要污染源之一。
The arterial road in city has become one of the important city pollution sources.
城市干道已成为城市主要污染源之一。
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