- 更新换代 gēngxīnhuàndài upgradethe replacement of old products, technology, or equipment with new generations; reform and renewal
- 改朝换代 gǎicháohuàndài regime changeto transition to a new dynasty or regime
- 交换代数 jiāohuàndàishù commutative algebra(math.) commutative algebra
- 交换代数学 jiāohuàndàishùxué commutative algebra(mathematics) commutative algebra