You do not know whether what you're told is true or false.

你不知道别人告诉你的是真的还是假的。

《柯林斯英汉双解大词典》

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You really cannot know how much C if any C of the information that comes to you by the grapevine is true or false.

VOA: special.2009.02.22

So if you wanna do something conditionally, you generally needs to ask the question, is the following true or false.

假如想在一定条件下做一件事情，你需要判断下这个条件，来看看条件是真还是假。

哈佛公开课 - 计算机科学课程节选

So even though we think of conditions as being Boolean values true or false, really underneath the hood true means anything other than zero.

即使我们考虑,布尔值的真假条件，在底层“真“表示非零。

哈佛公开课 - 计算机科学课程节选

Either or both could be true or false without affecting the truth or falsity of the other.

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And when this information, or reports, whether true or false, surface on the front page of newspapers, that makes the job of folks on the front lines tougher and it makes my job tougher -- which is why since I've been in office, my attitude has been zero tolerance for these kinds of leaks and speculation.

WHITEHOUSE: President Obama Holds a Press Conference on the Economy

He challenged our reason for being, what we thought, how we lived, the truth or falsity of what we believed to be true or false.

NEWYORKER: Midnight in Dostoevsky