输入模型已经过优化，使得模板中的模型访问变得非常简单。
The input model is optimized to make model access in the templates very simple.
举例来说，当数组经过优化而不需要连续存储时，JVM可以返回一个副本。
For example, the JVM might return a copy when it has optimized arrays in a way that does not store them contiguously.
无需修改程序源代码即可使用经过优化的sql语句替换表现不佳的SQL。
Replace poor performing SQL with a more optimal SQL statement without modifying the program source code.
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