Although the directory stack system supports multiple directories, it frequently gets used for only one or two while you temporarily pop somewhere else.
尽管目录堆栈系统支持多个目录，但通常是在您临时弹出到其他目录时将它用于一个或两个目录。
2
This means you can run multiple instances of a software stack on a single physical machine.
这意味着您可以在一台物理机运行一个软件栈的多个实例。
3
By switching on exception tracing, you will be able to provide multiple snapshots of the stack as an exception bubbles up through layers of application code.