符号链接是一个指针，指向文件在文件系统中的位置。
A symbolic link is a pointer to a file's location in the file system.
如果原始文件被删除，所有指向它的符号链接也就都被破坏了。
If the original file is deleted, all of the symbolic links become broken.
最后一个命令删除当前存档（这只是符号链接），重新创建相同的符号链接，但是指向新的存档。
The last command removes the current archive (which is merely a symbolic link) and recreates the same symbolic link pointing to the new archive.
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