换句话说，当我们把函数乘起来的时候，我们得到一个变量相加之后的函数。
In other words, when we multiply these functions, we get a function of the sum of those arguments.
事实上，所有这些变量似乎都是互相加强的。
In fact, all of these variables seem to reinforce each other.
在Add2Integers程序中，变量n1和n2代表了即将被相加的两个整数，变量to tal代表了相加之后的和。
In the Add2Integers program, the variables n1 and n2 represent the integers to be added, and the variable total represents the sum.
这指出了，自然而然地，计算机需要将存储在变量n1和n2中的值相加。
Which indicates, naturally enough, that the computer should add the values stored in the variables n1 and n2.
将变量值与表达式值相加，并将结果赋给该变量。
Adds the value of an expression to the value of a variable and assigns the result to the variable.
将变量值与表达式值相加，并将结果赋给该变量。
Adds the value of an expression to the value of a variable and assigns the result to the variable.
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