这一月度曲线记录了过去50年来二氧化碳持续上升的情况，这就是190个国家认识到需要聚集在哥本哈根的原因。

This seasonally undulating record of carbon dioxide's inexorable rise over the past 50 years goes a long way towards explaining why 190 countries have seen fit to gather now in Copenhagen.

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这些对象与第一节中使用的AggregateGroup类似，也跟踪记录udf所处理的每一个分组的聚集信息。

Those objects are similar to the AggregateGroup used in the first section, and they keep track of the aggregation information for each group that is processed by the UDF.

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然后它聚集记录以计算数据库中每艘船的捕获物总数。

It then aggregates the records to sum up the total catches for each boat in the database.

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