unproven [ʌnˈpru:vn]

例句:

• There are a lot of unproven allegations flying around.
  流言蜚语满天飞。
  
• There's no such thing as an unproven track record.
  根本不存在这种未被证实的记录.
  
• Utilities refuse to build any, since the technology is expensive and unproven.
  由于该技术投资巨大而又未得到证实, 从效用的角度来说不宜建造此类发电厂.
  
• But it's still a largely unproven process.
  来自SA
• He called allegations against him false and unproven.
  来自VOA
• Everything else is either a fantasy or an unproven theory.
  来自SA