Is it a couplet that makes a hero burst into tears and dies before he leaves the army?

It is dual. It is a masterpiece of Du Fu, and the whole poem is written in couplets. The original text is as follows:

Where to find the ancestral hall of the Prime Minister? There are many trees outside Jinguan City.

The green grass reflects the spring color on the steps, and the oriole sounds good in the sky through the leaves.

Three visits to the world have troubled the world, and two dynasties have helped the hearts of the old ministers.

He died before leaving the army, which made the hero burst into tears.