注：觉得本章内容与理解操作系统不直接相关，所以本章并未看完，也就没有翻译完，放在这里中是为了保证手册的完整。有兴趣的人可以去原址查看。
https://pdos.csail.mit.edu/6.828/2016/readings/i386/c03.htm
Chapter 3 Applications Instruction Set 程序指令集
This chapter presents an overview of the instructions which programmers can use to write application software for the 80386 executing in protected virtual-address mode. The instructions are grouped by categories of related functions.
本章是对80386保护模式下书写的程序中可以使用的指令的一个概览。根据其相关功能对这些指令分类。
The instructions not discussed in this chapter are those that are normally used only by operating-system programmers. Part II describes the operation of these instructions.
仅可用来操作系统中的指令在本章不涉及。第二部分会描述这些指令的操作。
The descriptions in this chapter assume that the 80386 is operating in protected mode with 32-bit addressing in effect; however, all instructions discussed are also available when 16-bit addressing is in effect in protected mode, real mode, or virtual 8086 mode. For any differences of operation that exist in the various modes , refer to Chapter 13 , Chapter 14 , or Chapter 15 .
本章假定80386工作在32位地址的保护模式；当然，所有涉及对于保护模式、实模式或虚拟8086模式下的16位地址时均可用。对于不同模式下的操作区别，查看第13章、第14章和第15章。
The instruction dictionary in Chapter 17 contains more detailed descriptions of all instructions, including encoding, operation, timing, effect on flags, and exceptions.
第17章中的指令字典有更指令描述，包含编码、操作、周期、标志位影响和异常。