Q: Which method for keeping cool during the summer is better for fuel efficiency -- air conditioning or opening the windows?
问：夏季开车时，哪种保持凉爽的方法更省油，开空调还是开窗？
Q: Which method for keeping cool during the summer is better for fuel efficiency -- air conditioning or opening the windows?
问：夏季开车时，哪种保持凉爽的方法更省油，开空调还是开窗？
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