... subject to stem : 以协议装货日期为准 subject index : 标题索引，主题索引 subject matter : 调查项目，主题，题目，题材，论题 ...
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粗略的游览一下索引就会知道它的标题。
A first glance at the index might have you wondering about the title.
如果没有第一项，或者第一项没有标题，该项就按照常规php数组索引越界处理。
If there is no first item, or if the first item does not have a title, this item is treated the same as any other out-of-bounds index in a PHP array.
您可以使用以 0 开头的索引或列标题名指定列。
You can identify columns using indexes starting at 0 or using the column heading name. To understand the columns in a CSV file, consider the following data
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