Literally: Thirty years on the east side of the river, thirty years on the west side of the river.
三十年河東，三十年河西 (traditional, Pinyin sān shí nián hé dōng, sān shí nián hé xī, simplified 三十年河东，三十年河西)
- Prosperity and decline never last.
- Life has its ups and downs.
- Everything in life is cyclical.
- Easy come, easy go.