这个价值以抽象和支持组合的形式表现。
This value comes in the form of abstraction and enablement of composition.
工程师不再在最基本的文件和代码模块层面工作，而是在能够表现他们正在进行的软件的商业价值的更高的抽象层面上工作。
Engineers no longer work at the rudimentary level of files and code modules. Rather, they work at a higher level of abstraction to address the business value of the software they are proposing.
使用PEAR DB模块和pdo抽象层的另一个价值在于您可以在sql语句中使用？操作符。
The other value in using the abstraction layers of the PEAR DB module and PDO is that you can use the? Operator in your SQL statements.
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