polydir is the absolute pathname of the directory to polyinstantiate.
polydir 是要多实例化的目录的绝对路径名。
This directory has a parent and “grandparent” directory, as we’ll see later. And pwd shows the directory’s absolute pathname
我们在后面将会看到，这个目录有父和“祖父”目录。
An absolute pathname begins with the root directory and follows the tree branch by branch until the path to the desired directory or file is completed.
绝对路径名从根目录开始，通过一个又一个的分支，一直到你要去的目录或者文件为止。
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