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》

Others say that the opposite is true: that international contests encourage false national pride and lead to misunderstanding and hatred.

另一些人则持相反的观点：国际比赛会助长虚假的民族自豪感，导致误解和仇恨。

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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

There's this notion of a Boolean value named after Mr. Bool, which is just a notion of true or false.

布尔值的概念是在布尔先生之后命名的，它是一个正确或错误的概念。

哈佛公开课 - 计算机科学课程节选

"The notion of a 'graveyard of empires' is actually a false extrapolation from something that is true -- that there is tactical and strategic difficulty, " Porter says.

CNN: Is Afghanistan really a 'graveyard of empires?'

What is undeniably true is that Hodgman has parlayed his false erudition to unexpected renown.

CNN: 'PC' explains almost everything for you

But replacing false ideas with true ones is precisely what transformative figures do, and certainly what Rand, who firmly believed in the power of reason and truth, was hoping to do.

FORBES: Magazine Article