Achilles heel
noun [ C usually singular ] uk/əˌkɪl.iːz ˈhiːl/ us/əˌkɪl.iːz ˈhiːl/
阿喀琉斯的脚踵,致命弱点,致命伤
a small problem or weakness in a person or system that can result in failure
Maths has always been my Achilles heel. 数学从来都是我的致命伤。
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