If you take China, and you just take Beijing, you can see on that traffic system, and the pollution associated with the consumption of energy as the cars expand at the price of the bicycles.
如果你拿中国，或者只是北京做例子， 你看它的交通系统， 及能源消耗所导致的污染 当汽车变得跟自行车一样便宜。