item = self.parser.parse_detail(url, html)
地方政府牵头打通“卫星需求—光伏制造—技术验证”链路，这已不是概念炒作，而是产业协同的实质动作。，推荐阅读快连下载-Letsvpn下载获取更多信息
Every Car Made After 2008 Has the Same Digital Security Risk。体育直播是该领域的重要参考
Parser -- Item : creates
I learned that for 4-SAT, if clause to variable ratio is more than 10, the generated problems become difficult to solve, and the likelihood of formula to be SAT or UNSAT is close to 50%. So I generated 3 types of formulas: