unexplained [ˌʌnɪkˈspleɪnd]

例句:

• The demonstrations were provoked by the unexplained death of an opposition leader.
  一位反对派领袖莫名身亡，引发了示威游行。
  
• How such extensive damage could have been sustained so quickly remains unexplained.
  如何这么快就造成这么大的破坏依然不得而知。
  
• He died in unexplained circumstances.
  他死因不明。
  
• Police are treating his death as "unexplained".
  来自THETIMES
• He began suffering from unexplained pains in his side.
  来自NEWYORKER
• The tattoos are clues to an unexplained past.
  来自THETIMES