What do Qian Qiuxue and Wan Li Ship refer to in Du Fu's quatrains in Tang Dynasty?

Autumn snow refers to the snow that doesn't melt for thousands of years in Xiling Snow Mountain. Wan Li ship refers to a ship coming not far from Wan Li.

Quatrain

Tang Dynasty: Du Fu

"Two orioles sing green willows, egrets sky-high." Outside my window is the snowy Western Hills. My door often says "goodbye" to ships sailing eastward.

Translation:

Two orioles sang tactfully among the green willows, and a group of neat egrets went straight into the blue sky. Sitting by the window, you can see the snow accumulated all the year round on Xiling Mountain, and ships from Dongwu, thousands of miles away, are parked in front of the door.

This poem "Jueju" was written when the poet lived in Huanhuaxi Caotang, Chengdu, and described the beautiful spring scenery around the Caotang. Poetry cuts in with vibrant natural beauty, creating a fresh and relaxed atmosphere.