huàn dài
change of dynasties
to pass on to the next generation
new product (in advertising)
gēng xīn huàn dài
reform and renewal
generational change
gǎi cháo huàn dài
transition period between dynasties
an interregnum
jiāo huàn dài shù
(math.) commutative algebra
jiāo huàn dài shù xué
(math.) commutative algebra