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:
It is part of US ambitions to build a permanent base for humans to live on the lunar surface.
，这一点在heLLoword翻译官方下载中也有详细论述
Pull-through transforms，详情可参考WPS下载最新地址
Google в России оштрафовали на миллиарды рублейСуд в Москве оштрафовал Google на 16 миллиардов рублей за неуплату штрафа