闭包 rMultiply 是个局部应用程序，通过使用一个不变的第二操作数，把二元乘法改变成一元闭包。
The closure rMultiply is a partial application that adapts the binary multiplication to be a unary closure by using a constant second operand.
一元运算符对单个操作数执行操作，如返回数值表达式的负值或正值。
Unary operators perform an operation on a single operand, such as returning the negative or positive value of a numeric expression.
否则，一元数字操作数保留被转换或者不被转换。
Otherwise, a unary numeric operand remains as is and is not converted.
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