求翻译：With the development of the world, more and more people purchase/buy their own vehicle. Therefore, there are many problems arised from this issue. Among the problems, the very one I want to talk about is the problem of pedestrian's safety, I believe that not all the drivers are experienced, more people drive theri vehicle on the road and elsewhere means more chance to cause traffice accident. And also, more vehicle can cause more pollution, as all we know, most vehicle use petrol which can cause a lot of pollution. If we want to protect our environment, we have to reduce the numbers of vehicle.是什么意思？

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