我必须针对手边的案例做出一些特定选择，这在采用示例代码时不可避免。
As always happens with example code, I've had to make some choices that are specific to the case at hand.
非零评级员（案例）的组成表明，评级员的选择（某一特定案例下）可对候选者的得分有一些影响。
The non-zero rater(case) component suggests that the choice of rater (for a given case) may have some impact on candidate scores.
本章通过一个案例和一些练习，来讲解一下如何选择和使用数据结构。
This chapter presents a case study with exercises that let you think about choosing data structures and practice using them.
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