unforgettable

Seeing the Northern Lights for the first time was an unforgettable experience.

(Chinese) 第一次看到北极光是一次令人难忘的经历。

The movie has an unforgettable ending that made almost everyone in the theater cry.

(Chinese) 这部电影有一个令人难忘的结局，几乎让电影院里的每个人都哭了。