durationn.持续时间；期间duration of load载荷期间duration of tide潮期duration of cycle循环时间duration of storm暴雨持续时间duration estimate时距估计Duration analysis持续性分析duration of labor[医] 产程(分娩时限)duration response低频响应,持续时间响应Duration of fever热程duration of blast吹炼期,吹炼时间