It's the last day of school.

今天是学校的最后一天。

Sunday is the day of the sun.

星期天是太阳日。

It's the cold day of the year.

这是今年最冷的一天。

It was the best day of my life.

这是我一生中最美好的一天。

But it's the last day of school.

但今天是学校的最后一天。

It was the day of the big match.

那是比赛的大日子。

It was the worst day of his life.

这是他一生中最糟糕的一天。

It's on the fourth day of October.

是在十月四日。

It's the best day of the week for me.

这是我一周中最好的日子。

This was the luckiest day of my life.

这是我一生中最幸运的一天。