reduce函数将对计数器(只是一些值为1的整数)进行总计。因此，提供给我的是在目标地震文件中某一个日期出现的次数。
My reduce function will then sum up the counters (which are just integers with the value of 1), thus providing me with the number of times a date occurs in a target earthquake file.
在5315B频率计数器有一个100MHz的频率范围，也有比例，总计测量能力。
The 5315B Frequency Counter has a 100MHz frequency range and also has ratio and totalize measurement capabilities.
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