"He is an inventor" 是指他是一个发明家。
"Inventor" 是英语中的名词，源于拉丁语 "inventus"，意思是"发明、创造"。
例句：
Thomas Edison is considered one of the greatest inventors of all time.
(托马斯·爱迪生被认为是有史以来最伟大的发明家之一。)
The young inventor's idea for a new kind of energy-efficient engine earned him a prize.
(这位年轻的发明家关于一种新型高效能引擎的想法让他赢得了奖项。)