The previous sentence is about two orioles singing in the green willows, which means two orioles singing gracefully among the green willow trees.
From Du Fu's "Quatrains" of the Tang Dynasty:
Two orioles sing in the green willows, and a row of egrets ascends to the blue sky.
The window contains Qianqiu snow of Xiling, and the door is docked with a ship thousands of miles away from Dongwu.
Translation: Two orioles sang gracefully among the green willow trees, and a neat group of egrets rushed straight into the blue sky. Sitting in front of the window, I can see the snow that never melts all year round on the west ridge, and the ships from Soochow, thousands of miles away, are moored in front of the door.
Extended information:
1. Poetry appreciation:
"Two orioles are singing in the green willows, and a row of egrets are ascending to the blue sky." Two orioles are singing, this is There is a sound. "A row of egrets ascending to the blue sky", this is a behavior and an action. One horizontally and one vertically, "two" and "one" are opposite; one horizontally and one vertically, a very bright natural scenery unfolds. In this poem, the word "Ming" is the most expressive, using anthropomorphic techniques to describe the oriole more vividly.
2. Creative background
In 762 AD, during the heyday of the Tang Dynasty, Yin Yanwu from Chengdu entered the dynasty. At that time, due to the "Anshi Rebellion", Du Fu fled to Zizhou for a time. The next year, the rebellion was put down and Yan Wu returned to Chengdu. Du Fu also returned to Chengdu thatched cottage. At that time, he was in a good mood. Faced with the vitality of this school, he couldn't help but write this short poem on the spot.