1514年，荷兰开始使用加号和减号。
蜜蜂会做加减法——它们用颜色来代替加号和减号。
Bees are capable of addition and subtraction — using colors in the place of plus and minus symbols.
它能包含变量、常量、运算符，例如加号和减号。
It can include variables, constants, and operating symbols, such as plus and minus signs.
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.
若要给相对值地精度估量地转换率，加号和减号一个规范错误地乐队由图中地虚线暗示。
To give an indication of the precision of the estimated transition rates, plus and minus one standard error bands are indicated by dashed lines in the figure.
它还详细描述了三个记号(加号、减号和整数)组合的具体项，解析器在扫描整个输入流时希望遇到这些项。
It also details in concrete terms the composition of the three tokens (a plus sign, a minus sign, and an integer) that the parser expects to encounter while scanning through the input stream.
它还详细描述了三个记号(加号、减号和整数)组合的具体项，解析器在扫描整个输入流时希望遇到这些项。
It also details in concrete terms the composition of the three tokens (a plus sign, a minus sign, and an integer) that the parser expects to encounter while scanning through the input stream.
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