Using the conventional meteorological and anemometer data and the Asian circulation data from 1971 to 2000,as well as the 8-type land use data from 1990 to 2000,an ecological/climatic effect model of sandstorm occurrence frequency and mean duration was established for the spring from March to May in Ningxia region.
利用宁夏1971~2000年常规气象、自记风及同期亚洲环流资料,并结合1990~2000年宁夏八大类土地详查资料,建立了对宁夏中部干旱带春季3~5月份沙尘暴发生频次和平均持续时间拟合效果较好的生态/气候影响分析模型。
Using the conventional meteorological and anemometer data and the Asian circulation data from 1971 to 2000, as well as the 8-type land use data from 1990 to 2000 , an ecological/climatic effect model of sandstorm occurrence frequency and mean duration was established for the spring from March to May in Ningxia region.
利用宁夏1971-2000年常规气象、自记风及同期亚洲环流资料,并结合1990-2000年宁夏8大类土地详查资料,建立了对宁夏中部干旱带春季3-5月沙尘暴发生频次和平均持续时间拟合效果较好的生态/气候影响分析模型。
The mean onset of headache was 3.4 days (range, 2-32 days) after delivery.
结果：产后头痛平均持续时间为3.4天。
The average recession lasts just 11 months.
一次衰退平均持续时间只有11个月。
A New Model of Average Break Arc Duration between Relay Contacts
继电器平均开断电弧持续时间的新模型
Average reflex threshold volume, average reflex latency and average reflex duration were markedly different in SIND, MIND and FC group.
但平均反射阈值、均反射潜伏期及平均反射持续时间之间却有显著差异。
mean time between overhaul
平均大修间隔时间大修平均间隔时间
mean time between defects
故障平均间隔时间欠缺之间平均时间
For the second year in a row, moreover, same-store sales, measured in pounds, were virtually unchanged.
同时连续第二年单店平均营业额维持不坠，
mean time to failure
平均寿命时间（MTTF）
mean time before failure
故障前平均时间修理间隔平均时间
The duration of the end-plate current parallels the lifetime for channel closing.
终极电流的持续时间与通道关闭的持续时间相平行。
mean time between events
事件间平均间隔时间
duration:Continuance or persistence in time.
"持续,持久:时间上的连续或持续."
Continuance or persistence in time.
持续，持久时间上的连续或持续
dynamic stability of equilibrium with continuous time
连续时间动态稳定均衡
mean time between forced outage
故障停用平均间隔时间
mean time between scram
事故停堆平均间隔时间
signal duration
信号持续时间，脉冲持续时间
Between 1987 and 1996, Singapore enjoyed an uninterrrupted average GDP growth of 8.9%.
从1987到1996年之间，新加坡取得了8.9%的持续平均经济增长。