He had an elated expression on his face when he received the promotion news.

elated 是形容词，来自动词 elate 的过去分词形式。elate 由前缀 e-（表示"向外"）和拉丁词根 lat（意为"携带"）组成，字面意思是"情绪被带出来"，引申为"兴高采烈的、欣喜若狂的"。 elated 形容人因为好消息或成功而极度高兴、兴奋的状态。