I am also nostalgic for authentic Thai culture which has subtly and gradually been replaced by American and European culture.

authentic 来自希腊语 authentikos，意思是"真实的、可信的"。这个词由前缀 auto-（自己）和词根 hentes（做、完成）组成，字面意思是"自己亲手完成的"，引申为"真实的、正宗的"。 在句中指泰国文化原本真实、未被外来文化影响的状态。