2. 全球最严、最清晰的能效硬约束
The Only Ones / Whitesnake (1978)
，详情可参考爱思助手下载最新版本
&& mkdir -p /home/${USERNAME} \
It is "probably the most dangerous time for adult Emperor penguins because they haven't got their waterproof suits on," he says. If they go into water, they are likely to die.
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: