As the energy and environmental problem more and more worse in the world, people pay much attention to the use of natural gas as a substitute fuel of vehicle.
随着世界资源和环境问题的日益突出，以天然气作为汽车代用燃料的技术越来越受到人们的重视。
As the energy and environmental problem more and more worse in the world, people pay much attention to the use of natural gas as a substitute fuel of vehicle.
随着世界资源和环境问题的日益突出，以天然气作为汽车代用燃料的技术越来越受到人们的重视。
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