为什么用加法计算？
当然，现在可以使用计算机做加法了？
I mean, of course, now you use a computer and it does the sums. Yes?
测试涉及简单的计算，如加法和减法。
The test involves simple calculations, such as addition and subtraction.
我们用加法机计算你的工资。
不少人想像计算机是一个很大的加法机器。
Many people imagine that a computer is a very large adding machine.
可是，实际上，算盘是一个加法机，计算器和计算机。
But, in fact, an abacus is an adding machine, calculator, and computer.
可是，实际上，算盘是一个加法机，计算器和计算机。
But, in fact, an abacus is an adding machine, calculator, and computer.
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