un+detect+able

• un-表示否定
• detect检测，来自拉丁语 'detegere'，意为揭开、揭露
• -able表示能够

无法检测的

detect

检测

detective

侦探

undesirable

不受欢迎的

unbelievable

难以置信的

1. 释义 1无法检测的

   The virus is undetectable in the blood.

2. 释义 1无法检测的

   The spy's identity remained undetectable for years.

3. 释义 1无法检测的

   The tiny defect in the material was undetectable to the naked eye.