Meteorological records in the past 50 years indicate that there has been a sharp decrease in sand dust storm frequency, which is in accordance with the decrease in annual mean wind speed.

近50年来多个站点的观测记录表明了沙尘暴的发生频率处于快速下降的过程，这恰好与年均风速的变化趋势较为一致。

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The industry is expecting rising cost and frequency of claims for flooding, subsidence and storm damage.

保险行业期望提高因洪水、地面下沉以及暴风雨损毁的索赔费用和频率。

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The simulations study how climate change might affect the frequency and intensity of 'cyclonic disturbances', which range from severe storms and gales to low-pressure areas that may not form a storm.

这一模型用于研究气候改变是怎样影响飓风骚扰的频度和强度的，研究范围包括严重的风暴和大风到不太会产生风暴的低气压地区。

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Storm frequency,he says, comes in cycles of 30 years.

VOA: standard.2009.12.21

The pattern of damage was similar to the pattern of big-storm frequency uncovered by Dr Elsner.

ECONOMIST: Eye on the storm | The

He thinks such a step is necessary, since forecasts show that storm frequency in Florida will pick up over the next few years.

FORBES: The Most Expensive States To Insure Your Home 2006

The fifth is the observation in reality of a predicted link between increased sea-surface temperatures and the frequency of the most intense categories of hurricane, typhoon and tropical storm.

ECONOMIST: Changing science