It is not yet known 机器人是否有一天能拥有象人一样的视力 ; 现在还不知道
The cause of the fire is not yet known.
火灾的原因尚不清楚。
The long-term recurrence rate is not yet known.
术后疝气的长期复发率尚不得而知。
Still, it is not yet known who is behind the attacks.
然而，到目前为止，还不清楚谁指使了这两起袭击。
Yet these meanings are old, and their history is not known.
VOA: special.2009.05.17
"There's a very poetic beauty in that, in that kind of urban war zone Americana that is not really known, not really talked about, not really seen, and yet it is part of the spine of America."
VOA: special.2010.06.21
And people are gonna have to learn about sablefish - which is a beautiful substitute for it, but yet it's not commonly known."
VOA: standard.2010.07.14
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