实体变量的使用需要非常小心，而且最好在你学习第5章的合适策略之前避免使用它们。

Instance variables must be used with a certain amount of care, and it is probably best to avoid them until you have a chance to learn about some of the appropriate strategies in Chapter 5.

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在你数据库中命名和输入的“列”却被重新命名和构造，被当成了程序代码中的实体变量。

Columns that are named and typed on your database are renamed and re-typed as instance variables in your application code.

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这个层次定义的变量就成为实体变量，或者简称为ivars，这些变量作为每个对象的一部分来存储。

Variables defined at this level are called instance variables, or ivars for short, and are stored as part of each object.

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