one-track mind

noun

🔊/ˌwʌn træk ˈmaɪnd/

[usually singular]

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if somebody has a one-track mind, they can only think about one subject (often used to refer to somebody thinking about sex)单向褊狭的思路；一根筋；满脑子只想着一件事（常指性爱）
- All he ever talks about is football. He’s got a one-track mind.他只谈论足球。他有一个专一的思想。