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.
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.
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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