运行不带此开关选项（默认设置）的压缩不会更改 DBIID；如果使用事务日志，可以让它每夜都运行，回收空白，但不减少文件的大小。
Running Compact with no switch (default setting) does not change the DBIID; it can run nightly if transaction logging is used, reclaiming white space, but not reducing file size.
早期的标记语言使用格式化指令，它指定了较低级别的细节设置，例如字体及字体大小的变化。
Early markup languages used formatting instructions that specified low-level details such as font and font size changes.
事实上，它的名字本身就表明它通常用于存储用户特定的设置或者首选项，如字体大小或者窗口布局(当然，您可以在其中存储任何您想要存储的内容)。
In fact, the name itself indicates this: a common use for it is to store user-specific Settings, or preferences, such as font size or window layout. (Of course, you can store anything you want in it.)
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