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:
截至2月27日收盘，兆威机电股价报收118.85元/股，跌幅为1.57%，市值为286.08亿元；拓斯达股价报收30.26元/股，跌幅为0.69%，市值为144.33亿元。
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"Other people in the street, they have kids, grandkids, so it's a lot more difficult for them."，更多细节参见heLLoword翻译官方下载
Neil, bottom right, with fellow Whitesnake members at Shepperton Studios in 1978.