Source: Where the water flows out: Heyuan. Fountain Origin. Source. It also refers to the root cause of things: source. Resources. Yuanyuan. Energy. Origin.
Yang: Bright. Refers to the "sun": sunlight. The sunny side. Xiangyang in the solar calendar. At sunset.
Idiom interpretation
Drinking water sources have a long history.
Yangchun, Baixue, Sanyang, Kaitai, Chaoyang, Mingfeng, Yin and Yang and wrong.
Tang poem Song jambic verse
Last year, I hit Sangganyuan, and this year I hit the onion river. -Li Bai's "Traveling South and Fighting North"
Doubting Wulingyuan is like growing old in Hanyin. -Zhang Jiuling's "Seeking a secluded place with a living man"
Looking at flowers in the east disturbs Luoyang people. -Li Bai's Luoyang Ink
The sun is like fire, and the next moment is Wan Li Road. -Bai Juyi's "Two Short Songs"