重载二元运算符时，也会隐式重载相应的赋值运算符(如果有)。
When a binary operator is overloaded, the corresponding assignment operator, if any, is also implicitly overloaded.
一元减号(-)和一元加号(+)与二元加号和减号都是相同的运算符。
The unary minus (-) and unary plus (+) are the same operators as binary minus and plus.
委托类型也提供二元+运算符，该运算符执行委托串联。
Delegate types also provide a binary + operator, which performs delegate concatenation.
只能使用四个二元算术运算符(加、减、乘、除)。
Only the four usual binary arithmetic operations (addition, subtraction, multiplication and division) are allowed.
只能使用四个二元算术运算符(加、减、乘、除)。
Only the four usual binary arithmetic operations (addition, subtraction, multiplication and division) are allowed.
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