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。

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The little boy can already do simple problems in addition and subtraction.

这个小不点孩子都已经会做简单的加减法问题了。

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They do so by starting chain-reactions that result in the addition and subtraction of molecular sub-units known as phosphate groups from particular proteins in the nerve cell being stimulated.

ECONOMIST: The Nobel prizes: Informed choices | The