英文书摘：两个否定不等于一个正确吗？
"Two wrongs don”t make a right, but don”t three lefts make a right? Two wrongs don”t make a right, but don”t two negatives make a positive?"
—— Andrew Clements, Things Not Seen
谷歌翻译，仅供参考：
“两个错误不等于一个正确，但三个左撇子不等于一个正确吗？两个错误不等于一个正确，但两个否定不等于一个正确吗？”
-安德鲁·克莱门茨，《看不到的东西》
