今天我们将讨论所有现代计算机的基本部分。基本上所有其他东西都使用的东西——算术和逻辑单元（ALU）。ALU可能不必最令人兴奋的名字，但它是计算机的数学大脑，负责计算机所做的所有计算！其实也没那么复杂。所以今天我们将使用前几集中学习到的二进制和逻辑门从头开始构建一个，然后在第7集中构建计算机的核心CPU时，我们将使用我们在这里制作的ALU。

Today we're going to talk about a fundamental part of all modern computers. The thing that basically everything else uses - the Arithmetic and Logic Unit (or the ALU). The ALU may not have to most exciting name, but it is the mathematical brain of a computer and is responsible for all the calculations your computer does! And it's actually not that complicated. So today we're going to use the binary and logic gates we learned in previous episodes to build one from scratch, and then we'll use our newly minted ALU when we construct the heart of a computer, the CPU, in episode 7.