枚举的成员语句什么意思，新手求帮忙

public enum BIBoardType
    {
        [Description("无外接板")]
        NoBoard = 0,
        [Description("DS18B20温度传感器")]
        DS18B20 = 1,
        [Description("温湿度")]
        STH10 = 2,
        [Description("光敏电阻")]
        Photoresistor = 3,
        [Description("单路继电")]
        SingleWayRelay = 4,
        [Description("雨滴")]
        RainDropMeter = 5,
        [Description("烟雾")]
        Smog = 6,
        [Description("燃气")]
        Gas = 7,
        [Description("土壤温湿度")]
        SoilTemperatureHumidity = 8,
        [Description("红外")]
        Ir = 9,
        [Description("光照度")]
        AmbientLight = 10,
        [Description("数码管显示器")]
        DigtalDisplay = 11,
        [Description("四路继电器")]
        FourWayRelay = 12,
        [Description("TTL-IO")]
        TTL_IO = 13,
        [Description("隔离IO")]
        Isolated_IO = 14,
        [Description("人体红外")]
        HumanIr = 15,
        [Description("酒精")]
        AlcoholDetector = 16,
        [Description("超声测距")]
        UltraSonicRangeMeter = 17,
        [Description("震动感应器")]
        VibrationDetector = 18,
        [Description("气体压力")]
        BarometricPressure = 19,
        [Description("数字加速度")]
        AcceleroMeter = 20,
        [Description("电子罗盘")]
        ElectronicCompass = 21,
        [Description("直流电机")]
        DCMotor = 22,
        [Description("步进电机")]
        StepMotor = 23,
        [Description("液晶模块")]
        LcdModule = 24,
        [Description("RFID")]
        RFID = 26,
        [Description("路由器")]
        Router = 49,
        [Description("终端设备")]
        Terminal = 50,
        [Description("通用")]
        Common = 253,
    }