每种日历女孩都是按照月份来命名的，其生产数量与她对应月份的天数一致。
Each Boy Toy Calendar Girl is named after a month, and the quantity of each doll that will be made will be equal to the number of days in that month.
党研究者按照月份为基础研究数据的时候发现，显然自杀事件在夏季发生的频率更高，在北部地区尤为如此，因为在北部地区，夏季的天数更多这一特点最为显著。
When they looked at the data on a month by month basis, it became clear that suicides were far more frequent in summer, particularly in the north, where the extended summer days are most pronounced.
当在派生类中重写时，返回指定月份中的天数。
When overridden in a derived class, returns the number of days in the specified month.
当在派生类中重写时，返回指定月份中的天数。
When overridden in a derived class, returns the number of days in the specified month.
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