Achilles' heel

Achilles' heel
n. phr. literary
A physical or psychological weakness named after the Greek hero Achilles who was invulnerable except for a spot on his heel.〖文〗阿喀琉斯的脚踵；致命弱点，唯一的弱点。
- John's Achilles' heel is his lack of talent with numbers and math. 约翰的致命弱点是缺乏数学天才。

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Achilles' heel
n.（名词）
A seemingly small but actually mortal weakness. 阿喀琉斯的脚踝：一看来很小但致命的弱点