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.
它将第二个操作数内的寄存器与第三个操作数内的常量加在一起，并将结果存储在第一个操作数内指定的寄存器中。
It adds together the register in the second operand with the constant in the third operand, and stores the result in the register specified in the first operand.
步骤4：所有的操作符都是二元的，也就是说第一个操作数位于操作符之前，第二个操作符位于操作符之后。
Step 4: All operators are binary, which means that the first operand is positioned before the operator, and the second operand is positioned after the operator.
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