"He is extremely handsome"是表达“他非常帅气”的英文表达方式。
来源： handsome是形容词，意思是帅气，漂亮，秀气。
以下是一些例句：
He's got a charming smile that makes him even more handsome.
(他有一个迷人的笑容，使他更帅气。)
I can't help but admire his handsome looks whenever I see him.
(每次看到他，我都忍不住羡慕他帅气的外貌。)
She thinks he's the most handsome man she's ever met.
(她认为他是她见过的最帅的男人。)