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海边的温彻斯特

体现了包含与被包含的关系。

在教学中要用学生熟悉的学习方式、使用通俗易懂的语言，对集合思想渗透。

再数一数中，只要学生能找到同一类事物的时候就可以一起数，放在一起，可以圈一圈、画一画、标一标等汇集总数，体现集合一一对应原则，并且标记数数、圈数、点数、这样不重复不遗漏，也能数的更准确。

集合图可以让学生感受到：把具有某种属性的一些对象，用封闭线圈起来就可以看作一个整体，就是一个集合，而圈内的就是集合的元素。集合的元素可以是物体、数、几何图形等。集合中的对象可能是有限个，可能是无限个，也有可能一个也没有就是空集

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