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Meaning of 三十年河东,三十年河西

Lookup via: Pinyin | Radicals
三 sān 十 shí 年 nián 河 hé 东 dōng , , 三 sān 十 shí 年 nián 河 hé 西 xī (Trad.: 三十年河東,三十年河西)
the river flows thirty years to the East, thirty years to the West (proverb); change is the only constant