换代

to transition to a new dynasty or regime / to replace an older product with an upgraded, new-generation one

to exchange / to change (clothes etc) / to substitute / to switch / to convert (currency)

to substitute / to act on behalf of others / to replace / generation / dynasty / age / period / (historical) era / (geological) eon

to transition to a new dynasty or regime

reform and renewal / generational change

(math.) commutative algebra

(math.) commutative algebra