naked eye

例句：

1. 1.The detective had a keen sense of observation and could see through the lies.
   这位侦探有着敏锐的观察力，能够识破谎言。
2. 2. She looked at him with her naked eye, noticing his slight smile.
   她用裸眼看着他，注意到了他微微的笑容。
3. 3.In the dark room, she used her naked eye to find the hidden treasure.
   在黑暗的房间中，她用裸眼找到了隐藏的宝藏。