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一元运算子有一个参数，而二元运算子则有两个参数。
Unary operators have one parameter, and binary operators have two parameters.
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在所有复合指派运算子上，多载二元运算子即隐含多载对等的复合指派。
On all compound assignment operators, overloading the binary operator implicitly overloads the equivalent compound assignment.
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