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This formula is satisfiable because if we set to b to true and a to false, then the whole formula is true. All other assignments make the formula false, but it doesn't change that the formula is satisfiable as long as there is at least one assignment makes the formula true.
，这一点在WPS官方版本下载中也有详细论述
arstechnica.com
這些數字徹底打破了「老年人不上網」的刻板印象。從「只會打電話發微信」到「短視頻原住民」，中國老年人完成了一次數字化的躍遷，但代價正在顯現。
Екатерина Улитина (Редактор отдела «Забота о себе»)