这样做不仅使代码变得更具可测试性，而且也使它不依赖于方法的全局变量。
Doing this not only has made the code more testable, but also made it not depend on the global variables in the method.
这样不仅提供了一个可用的，功能高级的用户界面，还提供了一强大的，可升级的，以及可管理的基础结构。
This provides not only a usable, highly functional user interface but a robust, scalable, and administrable infrastructure.
不仅映射和减法支持并行化，映射和减法运算也可结合到单个并行循环中，这样效率更高。
Not only are mapping and reduction amenable to parallelization, but the map and reduce operations can be combined into a single parallel pass, which is even more efficient.
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