据我所知,说不定,也未可知;
It is probably a matter of temperament, and for anything I know it may be glandular.
它可能事关性格, 且就我看来它可能是一种分泌物.
He is a spy for anything I know.
据我所知,他是个间谍.
For anything I know, he is a diligent student.
据我所知他是个勤奋的学生.
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