二次方，平方 square
三次方，立方 cube
四次方 the power of four, the fourth power
n次方 the power of n, the nth power
开方 evolution, extraction
二次方根，平方根 square root
三次方根，立方根 cube root
四次方根 the root of four, the fourth root
n次方根 the root of n, the nth root
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