Today is an unforgettable day to me.

今天对我来说是一个难忘的日子。

youdao

Today is an unforgettable day to me. I'll remember this day forever.

今天对我来说是个难忘的日子，我会永远记住的。

youdao

It is an unforgettable day for us because it hurt us deeply, it is the most painful day for us.

因为它深深地伤害我们，所以资讯科技是我们的一个忘不了的日子，现在是我们的最痛苦的日子。

youdao

He received the Queen's Gallantry Medal, and as he sits in west London, immaculate and calm, he listens as an unforgettable day is marked.

BBC: UK forces' Operational Awards honour battlefield bravery

On Christmas day, High Mass at the Duomo is an unforgettable experience.

CNN: The story