三千在英语中是 "three thousand"。它来源于拉丁语 "tres milia"，在英文中也常被写作 "3,000"。例句：

The city has a population of over three thousand.

(这座城市的人口超过三千。)

I have to buy at least three thousand pencils for the school.

(我必须至少为学校买三千支铅笔。)

希望这对您有帮助！