prologue: Translate architecture

prologue/architecture.xml

@@ -1,4 +1,4 @@
-<?xml version="1.0" encoding="ISO-8859-1"?>
+<?xml version="1.0" encoding="UTF-8"?>
 <!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
   "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
   <!ENTITY % general-entities SYSTEM "../general.ent">
@@ -8,9 +8,9 @@
 <sect1 id="pre-architecture">
   <?dbhtml filename="architecture.html"?>
 
-  <title>LFS Target Architectures</title>
+  <title>LFS 的目标架构</title>
 
-<para>The primary target architectures of LFS are the AMD/Intel x86 (32-bit)
+<!--para>The primary target architectures of LFS are the AMD/Intel x86 (32-bit)
 and x86_64 (64-bit) CPUs.  On the other hand, the instructions in this book are
 also known to work, with some modifications, with the Power PC and ARM CPUs. To
 build a system that utilizes one of these CPUs, the main prerequisite, in
@@ -18,36 +18,61 @@ addition to those on the next few pages, is an existing Linux system such as an
 earlier LFS installation, Ubuntu, Red Hat/Fedora, SuSE, or other distribution
 that targets the architecture that you have. Also note that a 32-bit
 distribution can be installed and used as a host system on a 64-bit AMD/Intel
-computer.</para>
+computer.</para-->
 
-<para>Some other facts about 64-bit systems need to be added here. When
+<para>LFS 的主要目标架构是 AMD/Intel 的 x86 (32 位) 和 x86_64 (64 位) CPU 。此外，
+	如果对本书中的一些指令作适当的修改，它们也应该适用于 Power PC 和 ARM 架构的
+	CPU。为了在一块这样的 CPU 上成功构建 LFS 系统，您首先需要一个能够在 CPU 上
+	正常运行的 Linux 系统。例如，一个已经构建好的 LFS 系统，或者 Ubuntu，
+	Red Hat/Fedora，SuSE 等支持您的硬件架构的发行版。另外，32 位发行版也能够在
+	64 位的 AMD/Intel 计算机上正常运行，并作为 LFS 的构建环境。</para>
+
+<!--para>Some other facts about 64-bit systems need to be added here. When
 compared to a 32-bit system, the sizes of executable programs are slightly
 larger and the execution speeds of arbitrary programs are only slightly faster.
 For example, in a test build of LFS-6.5 on a Core2Duo CPU based system, the
-following statistics were measured:</para>
+following statistics were measured:</para-->
+
+<para>关于 64 位系统，我们需要说明，与 32 位系统相比，64 位系统所需的空间稍大一些，
+	对于大多数程序来说，运行速度也仅仅稍快一些，没有特别明显的优势。例如，在一块
+	Core2Duo CPU 上构建 LFS-6.5 版本时，我们得到的实验数据为：</para>
 
-<screen><computeroutput>Architecture Build Time     Build Size
-32-bit       198.5 minutes  648 MB
-64-bit       190.6 minutes  709 MB</computeroutput></screen>
+<screen><computeroutput>架构		构建时间		系统大小
+32 位		198.5 minutes		648 MB
+64 位		190.6 minutes		709 MB</computeroutput></screen>
 
-<para>As you can see, the 64-bit build is only 4% faster and is 9% larger than
+<!--para>As you can see, the 64-bit build is only 4% faster and is 9% larger than
 the 32-bit build.  The gain from going to a 64-bit system is relatively
 minimal. Of course, if you have more than 4GB of RAM or want to manipulate
-data that exceeds 4GB, the advantages of a 64-bit system are substantial.</para>
+data that exceeds 4GB, the advantages of a 64-bit system are substantial.</para-->
+
+<para>可以看出，64 位系统仅仅比 32 位系统快 4% ，体积则大了 9% 。因此，并不需要
+	特意追求 64 位系统。然而如果您拥有超过 4GB 的内存，或需要操作大于 4GB 的数据，
+	64 位系统的优势就相当关键了。 </para>
 
-<note><para>The above discussion is only appropriate when comparing 
+<!--note><para>The above discussion is only appropriate when comparing 
 builds on the same hardware.  Modern 64-bit systems are considerably
 faster than older 64-bit systems and the LFS authors recommend building
-on a 64-bit system when given a choice.</para></note>
+on a 64-bit system when given a choice.</para></note-->
 
-<para>The default 64-bit build that results from LFS is considered a "pure"
+<note><para>以上讨论仅适用于当时的硬件。现代的 64 位系统比以前快得多，因此 LFS 作者
+	推荐尽量使用 64 位系统构建 LFS。</para></note>
+
+<!--para>The default 64-bit build that results from LFS is considered a "pure"
 64-bit system. That is, it supports 64-bit executables only. Building a
 "multi-lib" system requires compiling many applications twice, once for a
 32-bit system and once for a 64-bit system. This is not directly supported in
 LFS because it would interfere with the educational objective of providing the
 instructions needed for a straightforward base Linux system.  You can refer to
 the <ulink url="http://trac.clfs.org/">Cross Linux From Scratch</ulink>
-project for this advanced topic.</para>
+project for this advanced topic.</para-->
+
+<para>完全按照本书构建的 LFS 系统是一个<quote>纯粹的</quote>64 位系统。换句话说，
+	它只能运行 64 位可执行程序。构建一个<quote>multi-lib</quote> 系统需要将许多程序
+	编译两次，一次编译为 32 位，另一次编译为 64 位。本书不涉及这方面的内容，因为
+	它与本书提供一个最基本的 Linux 系统的教育目标相冲突。您可以参考
+	<ulink url="http://trac.clfs.org/">Cross Linux From Scratch</ulink> 项目获得
+	关于这个高级话题的更多信息。</para>
 
 <!-- This does not appear to be valid for LFS/BLFS any more
 <para>There is one last comment about 64-bit systems. There are some older