在本例中，求幂运算符是另一种形式的二进制运算符，所以使用现有BinaryOp case类就可以。

In this case, the exponentiation operator is another form of binary operator so the existing BinaryOp case class serves.

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基本逻辑元素(门或运算符)之一，它至少有两个二进制输入信号和一个二进制输出信号。

One of the basic logic elements (gates or operators) which has at least two binary input signals and a single binary output signal.

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