undetectable [ˌʌndɪˈtektəbl]

例句:

• The sound is virtually undetectable to the human ear.
  这声音实际上是人耳难以听得到的。
  
• The null result of the Michelson - Morley experiment suggests that the effects of the ether are undetectable.
  迈克耳 孙- 莫雷实验的否定结果使人想到,以太的效应是不能检查到的.
  
• One endogenous protein , S 2, became undetectable in old EDL and DIA muscles.
  S2在8月龄的膈肌和趾长伸肌存在,而在24月龄的膈肌和趾长伸肌中不能被检测到.
  
• Millions of people infected with HIV are undetectable.
  来自SA
• It's very hard to spread with undetectable viral loads.
  来自SA
• The the gravitational curvature would be the same everywhere and therefore undetectable.
  来自SA