What is the meaning of the ancient poem "On an autumn night, when the dawn is coming out of the gate to welcome the coolness"?

Translation: The 30,000-mile-long Yellow River flows eastward into the sea, and the 5,000-foot-high Huashan Mountain towers into the sky and reaches the blue sky. The people of the Central Plains had shed all their tears under the oppression of the Hu people. They had been looking forward to Wang's Northern Expedition for year after year.

"Feelings of the Dawn on an Autumn Night Coming Out of the Fence Gate to Welcome the Coolness" is a poem composed by Lu You, a poet from the Song Dynasty.

Full text: Thirty thousand miles of river flows eastward into the sea, and five thousand miles of mountains reach the sky. ?The remaining people shed tears in the dust, and look south to the king's division for another year.

Extended information:

The word "tears" has been repeated thousands of times, and contains infinite bitterness. I have shed tears for more than sixty years and have long since run out. But even if "eyes are dry and blood will eventually see", those survivors who cherish their motherland still look to the south; the dust raised by the Jin cavalry can't stop them from looking forward to the king's master. The heavy oppression of the people of the Central Plains, the long course of torture, and the unswerving and urgent desire to restore their faith have all been fully expressed.

With "Hu Chen" as the background of "End of Tears", the emotion becomes even more painful. The word "and" in the conclusion expands the upper limit of time. Year after year they looked forward to the Southern Song Dynasty's Northern Expedition, but year after year this wish came to nothing. They didn't know that the monarchs and ministers of the Southern Song Dynasty had completely forgotten them. The poet wrote about the bitter hope of the survivors in the North, but he was actually expressing his own disappointment.

They still keep looking forward to it. The people's patriotic enthusiasm is like a flame dancing underground, getting stronger and stronger over time; while the ruling group of the Southern Song Dynasty was drunkenly dreaming and dying by the West Lake, leaving behind the great rivers and mountains, the hatred of the country and the hatred of the family, it can be said that they have been dead for a long time. The poet's cry for the survivors was intended to arouse the vigilance of the rulers of the Southern Song Dynasty and arouse their aspirations for recovery.