如不能解压缩请更新rar压缩软件

供VM虚拟机维护使用

http://learn.tramsmart.net/forum.php?mod=viewthread&tid=2324

工欲善其事，必先利其器。
To do a good job, an artisan needs the best tools (idiom).
Good tools are prerequisite to the successful execution of a job.