千的九次方

例句：

1. 1. The square of a number is its ninth power.
   一个数的平方是它的九次方。
2. 2. The cube of a number is its ninth power.
   一个数的立方是它的九次方。
3. 3. The fourth root of a number is its ninth power.
   一个数的四次根是它的九次方。