At least he knows the truth.

至少他知道真相。

youdao

Only he knows the truth.

只有他知道真相。

youdao

What if he knows the truth? I don't care.

他知道了真相又怎样？我不在乎。

youdao

Kevorkian stressed that prosecutors can only infer his intentions from the videotapes of Youk's death: only he knows the truth.

CNN: Kevorkian Case: Kevorkian found guilty

Burton is a firm believer in the myth that vaccines cause autism, and he arrogantly holds the position that he knows the truth better than the thousands of scientists who have spent much of the past decade doing real science that proves him wrong.

FORBES: Congress Holds An Anti-Vaccination Hearing

We can't go to the appeal and he would like to appeal to anybody out there who knows the truth to come forward.

BBC: Families of Aston new year killers seek help to clear sons