你可能并不想深入文件系统的底层了解这些东西，但本文介绍的技术对于你理解文件系统的使用异常重要，因为存在数据丢失的风险。
You may not have wanted to get so in-depth with your file system but the techniques covered here are pretty important to understand particularly because there is a risk of data corruption.
填入你验光处方的数据(如果你不能完全理解验光单上的内容，大多数网站都提供有帮助来说明处方内容)，挑选你需要的选项。
Plug in your prescription details (if you can't make them all out, most sites have helpful tips on deciphering a prescription) and pick out your options.
一旦理解了ETL过程，你可以在其他的数据库环境中应用相同的过程。
Once you understand the ETL process, you can apply the same process to other database environments.
应用推荐