PayRate defines fields common to both hourly and salary employees, as shown in Listing 4.
payrate类定义周薪制职员和小时制职员通用的字段，见清单4。
Overtime pay doesn't make sense in the context of a salaried employee, so it can be pushed down from PayRate into the HourlyRate class.
加班工资对于周薪制职员没有意义，所以可以把它从payrate类转移到hourlyrate类中。
Overtime pay doesn't make sense in the context of a salaried employee, so it can be pushed down from PayRate into the HourlyRate class.
加班工资对于周薪制职员没有意义，所以可以把它从payrate类转移到hourlyrate类中。
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