rails_iui 为行定义了两个助手，出于演示目的，本例中同时使用了这两个助手。
The rails_iui defines two helpers for rows, both of which are used in this example for demonstration purposes.
导入的实际数据将进入各个部分的第三行，在本例中为Categories部分。
The real data to be imported comes in the third row of each section, in this case the Categories section.
调试器下部的每行(本例中为0至19行)给出了从单击Send到发生错误的详细跟踪。
Each of the lines underneath it (0-19, in this case) give a detailed trace from when you click Send to the occurring fault.
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