最后，再说个运算符**，它表示乘方，就是前一个数为底数，后一个数为指数的次幂运算。
Finally, the operator ** performs exponentiation; that is, it raises a number to a power.
如果存在指数部分，则其代表有效部分所乘的，10的乘方幂的指数。
The exponent, if present, indicates the power of 10 by which the significant part is to be scaled.
如果存在指数部分，则其代表有效部分所乘的，10的乘方幂的指数。
The exponent, if present, indicates the power of 10 by which the significant part is to be scaled.
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