The plus sign is used in addition and the minus is used in subtraction.

加号用于加法;减号用于减法.

《简明英汉词典》

The unary minus produces the negative of the value.

一元减号得到的运算对象的负值.

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If the integer is negative, the representation is prefixed by a minus sign.

如果该整数是负值, 那么将使用减号作为前缀.

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It can include variables, constants, and operating symbols, such as plus and minus signs.

它能包含变量 、 常量 、 运算符, 例如加号和减号.

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Unary plus provides symmetry with unary minus , although it doesn't have any effect.

一元加号的含义与一元减号相反, 虽然它实际并不做任何事情.

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