have a one-track mindOBSESSIONto be continuously thinking about one particular thing, especially sex 脑子里只想着一件事〔尤指性事〕
Examples from the Corpus
have a one-track mind• That guy has a one-track mind.
Examples from the Corpus
one-track mind• Now, an animal has a one-track mind.• I was a fully equipped birdwatcher, very inexperienced, perhaps, but with a one-track mind.• But all my wit and wisdom were wasted on Karen's one-track mind.