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How do I represent a one-to-many, or many-to-many, relationship between two classes?
怎样表示两个类之间一对多或多对多的关系？
The php-based Chi Square software package I developed consists of classes for analyzing frequency data that is classified along one or two dimensions (ChiSquare1D.php and ChiSquare2D.php).
我开发的基于php的X平方分布软件包由用于分析频率数据的类构成，频率数据是按照一维或两维(ChiS quare1D . php和chis quare2D . php)进行分类的。
Instead of doing that work all in one or two classes, I propose we spend 10-15 minutes in each class meeting for several months, to read section-by-section closely.
我们不会在一到两节课内完成该诗，我计划在接下来的数月中，每次上课用10到15分钟来分段阅读该诗。
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