Some trucks now run on cleaner burning diesel fuel engines, while others are using compressed or liquefied natural gas.
有些卡车已经使用清洁柴油引擎。其它一些卡车也有使用压缩或液化天然气燃料的。
Buses emit more carbon than trains, but that can be minimized by using hybrid or compressed-natural-gas engines.
公车比火车排放的碳更多，但通过使用混合燃料车或压缩天然气引擎可以减少至最低。
At present, except the small proportion of the pure natural gas engines, CNG vehicle powered device is basically flexible-fuel engine that can use natural gas or gasoline dividedly.
目前，我国的CNG汽车动力装置，除比例很小的纯天然气发动机之外，基本上是可以分别燃用天然气和汽油的两用燃料发动机。
In addition to low emissions, natural gas can also be used as a petroleum fuel substitute or extender as in the case of dual fuel engines.
除排放低外，天然气可以替代石油燃料，或作为双燃料发动机的混合添加物。
In addition to low emissions, natural gas can also be used as a petroleum fuel substitute or extender as in the case of dual fuel engines.
除排放低外，天然气可以替代石油燃料，或作为双燃料发动机的混合添加物。
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