If the item is an index, then you parse the object and create an object representing the data you are about to process: the keyword associated with the index and the number of tweets in the index.
如果条目是索引，那么您就解析该对象并创建一个表示您要处理的数据的对象：与索引相关联的关键词和索引中tweet的数量。
If the data is stored sequentially, the time to find the item is proportional to the size of the list. For each element, a hash function calculates a number, which is used as an index into the table.
如果数据是序列存储的，从中查询一个项的时间取决于数据列的大小。
We examine each row in turn, obtaining a model index for the first item in each row, and read the data stored for that item in the model.
我们按顺序逐行检查，获得每行第一个项的模型索引，然后读取存储在模型项里的数据。
We examine each row in turn, obtaining a model index for the first item in each row, and read the data stored for that item in the model.
我们按顺序逐行检查，获得每行第一个项的模型索引，然后读取存储在模型项里的数据。
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