In my experience, it will usually be a particular inner or nested loop, or a call to some third party library methods, which is the main culprit for running the program slow.
以我的经验来看，导致程序运行速度慢得罪魁祸首可能就是某个内部或嵌套循环，也可能是对第三方库函数的调用。
Inner Mongolia, China is now, due to successive years of drought and the West Liaohe River, the largest desert reservoir in Asia muruin sum reservoirs dried up, library overturned.
现在我国内蒙古，由于连年干旱和西辽河，使亚洲最大的沙漠水库莫力庙水库干涸，库底朝天。
Therefore, the standard library can be used to provide realistic and interesting examples well before a reader can be assumed to understand its inner workings.
因此，在假定读者已经理解了标准库的内部工作原理之前就可以利用它提供许多更实际更有趣的例子。
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