Làjiāo shì wǒ de tiāndí, měi cì chī le dōu nánshòu.
Chili peppers are my nemesis — I feel terrible every time I eat them.
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天 (heaven; natural) + 敌 (enemy) — a natural enemy, given by nature rather than chosen. Can be used humorously in everyday speech to describe things a person inherently cannot stand.
