What does the ancient poem "Two Farewell Songs" mean?

Vernacular translation:

The yesterday that passed away when you abandoned me is irretrievable.

Today has disturbed my mood and made me worried.

The long wind blows tens of thousands of miles and brings autumn geese. For this, you can drink happily and get drunk in the tall buildings.

Your articles are very Jian'an style, and my poems are like Xie Tiao's beautiful and clear hair.

We all have great thoughts, and want to climb up to the nine heavens to pick up a bright moon.

The water flows even more violently when the sword is drawn to cut off the water. When a cup is raised to relieve the sorrow, the mood becomes even more sad.

If you can’t live a happy life in this world, it’s better to drift in a boat tomorrow with disheveled hair.

Original text

Those who abandon me will not be able to keep yesterday’s day; those who intoxicate my heart will have many worries today. The autumn wind blows the wild geese crossing the Fen River, and the setting sun follows the guests down the west tower. The unicorn guarding the bones beside the garden can protect the bright hair in the middle of the night. Xiaoman drank in the flowing clouds of spring, drunkenly leaned against the plum blossoms and embraced the full moon. The dark fragrance blows away and the moon is about to flow, and the sound of pines a hundred feet away calls out the sorrow. I have hung a bronze medal under the old locust tree early in the morning, and I can only fish with a short straw raincoat.

This is a farewell poem. In the poem, the poet is full of emotions, full of pride and joy, but also unable to suppress depression and injustice from time to time. His emotions are full of ups and downs, twists and turns, expressing his heroic feelings that leave the world behind.