one-track mind

mind that can think only of a single subject, interest, etc 只能想著一件事的头脑: He's got a one-track mind -- all he ever thinks about is sex! 他只有一个心思--想的都是性事!

one, one after another, one another, one day, one p (also 1p), one's bread is buttered, one's opposite number, one-, one-armed bandit, one-horse, one-liner, one-man band, one-man show, one-night stand, one-off, one-sided, one-sidedly, one-sidedness, one-time, one-to-one, one-upmanship, one-way, onerous, oneself, ongoing, onion, online, onlooker, only, only that, only too, ono, onomatopoeia, onomatopoeic, onrush, onset, onshore, onside, onslaught, onto,