不得而知

• The compilers are unknown .
  编录者是谁不得而知。
• I was by no means certain that he had noticed the sounds .
  他是否注意到那种声音，那我就不得而知了。
• And still the cause of the phocomelia outbreak remained unknown .
  然而，畸形儿病例大量发生的原因不得而知。
• What sophia's reflections were upon this occasion i cannot pretend to determine .
  素绯雅对于这事怎样思前想后，我却不得而知。
• They had things one didn't know about in the background of their lives and minds .
  他们的生活和思想背后都有旁人不得而知的东西。
• Whether such an arrangement was ever within the bounds of action cannot be known .
  至于这样一种建议办法究竟是否达到行动的程度，则不得而知了。
• Where the nets go from there is still up in the air
  网队将去向何方仍不得而知。
• Reyes their reason for leaving is still unknown
  雷耶斯离职的原因尚不得而知。
• What would the surgeon be able to do for me
  这个治疗会给我带来什么不得而知。
• The name of the person who wrote it is not known
  作者的名字已经不得而知了。