unaided eye

英 [ʌn'eɪdɪd aɪ] 美 [ʌn'eɪdɪd aɪ]

• n. 肉眼

例句

用作名词 (n.)

1. That comet is invisible to the unaided eye.
   那颗彗星只用肉眼是看不到的。
2. Germs are too small to be seen with a naked eye.
   细菌太小，用肉眼是看不到的。