The reason why he was late is unknown yet.

他为什么迟到的原因不清楚。

youdao

But, who is behind the scenes, unknown yet.

然而，幕后黑手到底是谁，仍不得而知。

youdao

Whether the singer can come or not is unknown yet.

那个歌手是否能来不知道。

youdao

He is afraid of the unknown, yet he forges on as he knows he must start looking if he is to find new cheese.

FORBES: Change Happens. Embrace It. Enjoy It. Look Forward To It.

Unknown as yet is whether fear of terrorism will affect demand.

WSJ: N.Y.'s Runner-in-Chief Honors Boston

Another was with Deutsche Bank and another with a bank as yet unknown.

FORBES: This Is One Way To Kill The European Banking System: Monte Dei Paschi And Nomura