Song of Eternal Sorrow What is the poem of Tang Xuanzong who missed Yang Guifei on his way back to Beijing?

The emperor couldn't save her, so he had to cover his face. Later, when he turned to look, there was blood and tears.

Above, he looked for the green void, below, the yellow spring, but he didn't find the one he was looking for in two places.

On the seventh day of July, in the Palace of Eternal Life, we secretly told each other in the quiet midnight world.

We hope to fly in heaven, two birds become one and grow on the earth, two branches of a tree. ..

The earth endures, and the sky endures; One day both will end, and this endless sadness will last forever.