麻烦的是，投资者购买股票的原因是不可知的。

The trouble is that it is impossible to know why investors are buying.

youdao

教旨是关乎“不可见”的学问，即：关乎未知与不可知的学说。

Dogma is the science of the unseen: the doctrine of the unknown and unknowable.

youdao

当您需要一种对协议不可知的处理程序时，可以使用逻辑处理程序。

The logical handler is used when you want a handler that is agnostic of the protocol.

youdao

The first is, that while God's promise is sure, the manner and the timing of its fulfillment is quite unpredictable.

首先是，上帝的承诺是确定无疑的，但实现的方法和时机却都是不可知的。

耶鲁公开课 - 旧约导论课程节选