they say if more people rode bikes to work ,there would be fewer cars and less dirty air

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• they say if more people rode bikes to work ,there would be fewer cars and less dirty air
• 英语翻译Some people are against the idea of building more bikes lanes because they are expensive.But roads for cars are even more expersive than bike lanes because cars wear rosds out faster than bikes .If we had more bikes lanes,perhaps fewer people would drive cars.This would make the cost of building and taking care of all the roads much less in the long run
• they say if more people rode bikes to work ,there would be fewer cars and less dirty air为什么rode 和 would要过去时态?
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