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。