around half of the private cars can be reduced from the road什么意思

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• around half of the private cars can be reduced from the road什么意思
• around half of the private cars can be reduced from the road什么意思
• There is a new problem involved in the popularity of private cars ___ road conditions need___(improve) 为什么第一格只能用that不用
• 4.There is a new problem involved in the popularity of private cars road conditions need ---------.