In the context of Web applications, iteration is primarily used to fetch and display collections of data, typically in the form of a list or sequence of rows in a table.
在Web应用程序环境中，迭代主要用于访存和显示数据集，通常是以列表或表中的一系列行的形式显示。
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The task of the robots is to fetch raw materials from an input storage, move them in a particular sequence by machines and finally deliver them to a delivery area.