Put near large cities,natural vegetation becomes scarce,and introduced trees,ornamental shrubs and gardens are far from adequate in absorbing motor vehicle and industrial air pollutants.

 
  • 可是邻近大城市地区的天然植被日渐稀少,而移植树木、观赏灌木及花园,又远不足以吸收机动车辆和工业带来的空气污染物质。
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