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小时候,曾为这个问题苦恼:先有鸡?先有蛋?长大了,发现类似问题俯拾皆是。在烟草大省云南,听说谁要一提控烟,就会受到围攻:你五块
When I was a kid, I was distressed by this problem: first chicken, first egg, grew up and found similar problems everywhere. In the tobacco province of Yunnan, I heard that anyone wanting to mention tobacco control will be besieged: you five