... 加法操作符(Addition Operator) 减法操作符(Subtraction Operator) 转换操作符(Shift Operators) ...
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What is the difference between the unary minus operator and the binary subtraction operator?
一元操作符负号和二元操作符减号的区别是什么？
The subtract operator, however, is not commutative; therefore, you need two operations to handle the value to be subtracted and the value from which the subtraction will take place.
但是，减法运算符是不可交换的；所以，需要两个操作来处理减数和被减数。
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