美國國土安全部（Department of Homeland Security）本月稍早的一份新聞稿指出：「連續第九個月，美國邊境巡邏隊未將任何非法移民釋放進入美國境內。」
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“尝鲜”明黄色的门头不大，挂着新年装饰品。 南方周末记者贾梦雅｜摄
SAT (short for "satisfiability") is a logic problem that given a boolean formula, it asks whether the boolean formula has an assignment that makes the problem true. An example boolean formula is: