Xi Jinping used this suyu in a speech at a forum about the protection and development of the Yellow River on September 18th, 2019.
Meaning
Cannot be done in one day, e.g. Rome was not built in a day (罗马非一日之功).
Also commonly used as: 冰冻三尺非一日之寒 bīng dòng sǎn chǐ fěi yǐ rì zhī hán – Ice three feet thick can’t be frozen in one day.
Original
“推动黄河流域生态保护和高质量发展，非一日之功.”