They are more environmentally friendly than regular cars.
它们比普通汽车更环保。
Some environmentally-friendly cars are really expensive.
一些环保汽车十分贵。
Most of the new environmentally-friendly cars will be used for public transport.
新的环保车，大部分将用于公共交通。
Battery cars use electric energy as their driving force, which is clean and environmentally friendly.
电瓶车是靠电能作为动力的，安静环保。
Battery cars use electric energy as their driving force, which is clean and environmentally friendly.
电瓶车是靠电能作为动力的，安静环保。
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