革故鼎新

gé gù dǐng xīn

to discard the old and introduce the new (idiom); to innovate

革

gé

animal hide

故

gù

happening

鼎

dǐng

ancient cooking cauldron with two looped handles and three or four legs

新

xīn

abbr. for Xinjiang 新疆[Xin1 jiang1]