aone-trackmind一根筋
Meaning: If someone has a one-track mind, they spend most of their time thinking about one subject.
Forexample:
Brian’s had a one-track mind since he started his own company. All he thinks about now is business and making money.
Brian自从开了公司后，就成了一根筋了，脑子想的全部都是事业跟赚钱。
Mark’s upset because Jenny said he’s got a one-track mind and he’s always thinking about sex.
Mark感到很烦燥，因为Jenny说他一根筋老想着浪漫。
Sheisanunimaginablepersonandhasaone-trackmind.
她是一个缺乏想像力的人，并且头脑偏狭。
Allyouthinkaboutisgirls–youhaveaone–trackmind.
你想的就是女人-你的思路太狭窄了。