不要在定价策略中尝试犯第一种错误。
Don't be tempted to make the number one error in pricing strategy.
第一种方法要求程序在在进行每一个重大操作之后，检查错误。
The first method requires the program to check for error conditions after every non-trivial action.
他所强调的第一种应用就是用其发现普通开发者使用Lucene时的常犯错误：没有关闭IndexReader而导致的内存泄漏。
One he highlighted was a common developer error when working with Lucene: an apparent memory leak caused by the developer failing to close an IndexReader.
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