如一 (rú yī) means “consistent; the same; unvarying”. It is an HSK 6 Chinese word in the HSK 3.0 vocabulary.
Practice each character:
他数十年如一日地坚持锻炼。
Tā shù shí nián rú yī rì de jiānchí duànliàn.
He has persisted in exercising consistently for decades.
Updated: 2026-07-18