What do the first two sentences of "Send Yuan 20 An Xi" express?

The time, place and atmosphere of farewell are written in the first two sentences of "Send Yuan 20 An Xi", and the expression used is narrative.

Original text:

When sending Yuan Er to Anxi

The rain in the early morning moistened the dust of the land, the inn of the inn, the branches and leaves of the inn, and a new leaf

Sincerely advise friends to drink a glass of wine, and it is difficult to meet their loved ones when they go out to Yang Guan in the west.

Comment on words and phrases:

(1) Yuan Er: Yuan, who ranks second, is a friend of the author. Dispatch: Send a special envoy. Anxi: refers to Anxi, the capital of the Tang Dynasty, near Kuqa in Xinjiang today.

⑵ Weicheng: Xianyang City in Qin Dynasty, Weicheng City in Han Dynasty, northwest of Chang 'an, and north bank of Weishui. Yu Chao: It rained this morning. Yi: wet.

(3) Guest House: Hotel.

⑷ Yangguan: Located in the southwest of Dunhuang County, Gansu Province, it is the main road leading to the western regions in ancient times.

Translation:

The light rain in the morning moistened the dust on the Acropolis, and the willow branches and leaves in the inn pavilion were fresh and tender.

Sincerely advise friends to have another glass of wine. It's hard to meet old relatives when you go west from Yangguan.