Thirty years in Hedong, thirty years in Hexi
Pinyin Sā n Shí niá n Hé d not ng, sān shí nián hé xī
Explanation [explanation] Feng Shui was in the east of the river 3 years ago, but in the west of the river 3 years later. Metaphor things change, ups and downs.
source [source] Qing Wu Jingzi's "The Scholars" 46th time: "Mr. Da,' Thirty years east of the river, thirty years west of the river'! Just like thirty years ago, I saw with my own eyes what advantages your two families had. "