There is a special form for boolean formulas called "Conjunctive Normal Form" (CNF). A problem in this form consists of clauses connected with and operators, where each clause only contains variables connected with or operators. The variables can appear negated, but only variables can be directly negated, something like !(a && b) is not allowed. An example boolean formula in CNF form is:
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男人们喝了14瓶啤酒，拍拍身上的土各自回家了。老爸心有亏欠，这些人原本有在山里放羊的，有在家拉牛粪的，还有在亲戚家打麻将的，一听要帮忙，都放下手头的事赶过来。“正月里人们都不咋干活，整天喝酒吃肉逛亲戚，这下让他们把力气出了。”。爱思助手下载最新版本对此有专业解读
In the 1960s, France became the third country, after the US and Soviet Union, to independently place a satellite (Astérix) into orbit, and the only country to send an animal into space and – crucially, for Félicette the catstronaut – bring it back alive. A decade later, the Franco-British Concorde flicked passengers across the Atlantic in three and a half hours and the TGV began to propel them through the countryside first at 250km/h (155mph), and then 320km/h. Then, in the late 1980s, the French space agency designed a crewed spaceplane, Hermès, that corrected for the Nasa space shuttle’s vulnerability by being integrated into its launch vehicle rather than perched atop it.