What is the explanation of Bai Juyi's ancient poems except night?

Translation:

At the end of the year and the beginning of the year, homesickness followed, but I couldn't go home in the distant world.

The old world is about to add another year, because illness is no longer glamorous.

I still often miss my hometown, and I no longer pursue fame and fortune.

It will be forty-nine years since the Spring Festival tomorrow. It's time to reflect on our previous mistakes.

Poetic style:

He usually only chooses the most typical thing, highlighting a theme, "a sad thing", and the theme is very clear. In order to convey the theme to readers more clearly, you can add a small preface under the title of the poem to indicate the theme, or "show your will" to highlight the theme.

Secondly, the artistic features of Bai poetry are also reflected in the portrayal of characters. He can grasp the characteristics of the characters and draw the characters vividly by line drawing. However, the poetry of Bai poetry is not simple, and he often reposes the meaning with simple sentences, which has achieved amazing artistic effects.