durationn.持续时间；期间duration of guaranty保证期限duration of totality全食时间duration in scanning扫掠持续时间,扫描持续时间duration compression历时压缩duration of immunity元材料蜂胶灭活苗duration of sunshine日照时间duration of charging充电时间,加注时间Duration of diabetes病程duration of exciting激发期间duration of diapause滞育时间滞育时间,停滞时间