durations持续期
durationn.持续时间;期间
duration of mineralization矿化持续时间
duration of storm rainfall暴雨历时
duration-strength factor持续时间-强度因素
duration-modulated pulse宽度调制脉冲
duration of stage of labor产程时间
duration of certain stages一定发育阶段
duration of breaker contact断电器接触时间