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 * 2 - [电子计算 - Electronic Computing)](https://www.bilibili.com/video/av9066628/)
 * 3 - [布尔逻辑与逻辑电路 - Boolean Logic & Logic Gates](https://www.bilibili.com/video/av11557339/)
 * 4 - [二进制 - Representing Numbers and Letters with Binary](https://www.bilibili.com/video/av11592079/)
-* 第 5 集 - [算术逻辑单元 (How Computers Calculate - the ALU)](https://www.bilibili.com/video/av12742941/)
-* 第 6 集 - [寄存器&内存 (Registers and RAM)](https://www.bilibili.com/video/av12881796/)
-* 第 7 集 - [CPU (The Central Processing Unit (CPU))](https://www.bilibili.com/video/av12881976/)
-* 第 8 集 - [指令和程序 (Instructions & Programs)](https://www.bilibili.com/video/av9875360/)
+* 5 - [算术逻辑单元 - How Computers Calculate - the ALU)](https://www.bilibili.com/video/av12742941/)
+* 6 - [寄存器&内存 - Registers and RAM)](https://www.bilibili.com/video/av12881796/)
+* 7 - [中央处理器 - The Central Processing Unit(CPU)](https://www.bilibili.com/video/av12881976/)
+* 8 - [指令和程序 - Instructions & Programs](https://www.bilibili.com/video/av9875360/)
 * 第 9 集 -  [高级CPU设计 (Advanced CPU Designs)](https://www.bilibili.com/video/av11867964/)
 * 第 10 集 - [编程史话 (Early Programming)](https://www.bilibili.com/video/av13582556/)
 * 第 11 集 - [编程语言 (The First Programming Languages)](https://www.bilibili.com/video/av14228148/)