He had not seen his father since that graduation day.

从毕业那天起，他就没见过他的父亲。

Graduation day is a rainy day.

毕业那天，也是雨天。

Graduation day, I saw Kyle.

毕业那天，我看见了凯尔。

My graduation day has finally arrived.

我毕业的日子终于到了。

Sorry, sir. But it's our graduation day.

对不起，不过，今天是毕业的日子嘛。