• 1. 真否定: True Negative
• 2. 真否定句: true negative

• 1.如果在它前面放上一个单否定，就会被求值为真，因此放上一个双否定将被求值为假。
  Putting a single negation in front of it will evaluate to true, thus a double negation will evaluate to false.
  dict.yoduao.com
• 2.很多评论者看上去似乎是对那些职业的气候变化否定论者的无稽之谈信以为真，而且还继承了他们的虚夸言辞和思维方法。
  Many of the posters appear to have fallen for the nonsense produced by professional climate change deniers, and to have adopted their rhetoric and methods.
  dict.yoduao.com
• 3.所有这些情境，两个前提为真，结论的否定也为真。
  So there are all sort of situation where these two premises are true and so is the negation of the conclusion.
  dict.yoduao.com

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