火眼金睛 sharp eyes
Explanation
原指《西游记》中孙悟空能识别妖魔鬼怪的眼睛。后用以形容人的眼光锐利，能够识别真伪。比喻人目光敏锐，善于辨别真伪。
Originally refers to Sun Wukong's ability in Journey to the West to identify demons and ghosts. Later used to describe someone's sharp eyes and ability to identify authenticity. It is used to describe someone's sharp eyes, good at distinguishing the truth from falsehood。
Origin Story
话说唐僧师徒四人西天取经，路过一个村庄时，发现村里的人们一个个都愁眉苦脸，原来是村里闹妖怪，这只妖怪法力高强，能够幻化成人形，迷惑人心，村民们都束手无策。孙悟空自告奋勇，说自己有火眼金睛，能识破妖怪的伪装，村民们都把希望寄托在了孙悟空身上。孙悟空来到村里，仔细观察每个村民，他用火眼金睛仔细辨别，发现原来妖怪幻化成村长的模样，正在暗中操控着村民们。孙悟空一个筋斗云来到妖怪面前，与妖怪大战三百回合，最终用金箍棒将妖怪制服。村里的人们终于摆脱了妖怪的魔爪，恢复了往日的平静，都称赞孙悟空火眼金睛，本领高强。
The story is about Sun Wukong, the Monkey King. Once, on his way to the west, he encountered a village community who were all sad and desperate. A demon had transformed himself into the leader of the village and was misleading everyone. Because Sun Wukong has sharp eyes, he could easily recognize this demon and reveal its true form. By using his magical abilities, he quickly defeated the demon and saved the village.
Usage
形容人目光敏锐，善于辨别真伪。
Describes someone with sharp eyes, good at distinguishing authenticity。
Examples
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他火眼金睛，一眼就看穿了骗子的谎言。
ta huoyanjinjing, yiyanye kanchuanle pianzide huangyan.
With his sharp eyes, he saw through the liar's lies at a glance.
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局长火眼金睛，很快就识破了他们的阴谋诡计。
juchang huoyanjinjing, henkuai jiu shipo le tamen de yinmou guiji
The director has sharp eyes and quickly saw through their conspiracy。