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.
Most of these are probably self explanatory, addition, subtraction, multiplication, division, and anyone?
其中很多都不需要加以说明的,像加号,减号,乘号,除号和?
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