We do addition and subtraction in arithmetic.

在算术里，我们作加减运算。

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Instead symbols like + or * are used to define functions that can do things like normal numerical addition and subtraction.

相反，使用 +或 *等符号定义可以执行普通数字加减法的函数。

youdao

Instead symbols like + or * are used to define functions that can do things like normal numerical addition and subtraction.

相反，使用 +或 *等符号定义可以执行普通数字加减法的函数。

youdao