学生必须具备以下条件：良好的计算机使用技能，晚上和周末有空，了解篮球规则和统计数据。
Students must meet all of the following requirements: good computer skills, available evenings and weekends, knowing basketball rules and statistics.
人们首先想到的是某种全球统计数据，某种指标，它将对各国的经济和环境条件进行评级，并显示出两者之间的关系。
Thoughts turn first to some sort of global statistic, some indicator which would rate the wealth of nations in both economic and environmental terms and show a relationship between the two.
这里你的主要兴趣是从关联建立相关的映射，然后对它们计数作为条件的一部分。
Your main interest here is creating the relevant mappings from a relation, and then enumerating them as part of a condition.
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