东非的干旱周期缩短得非常显著。
The drought cycle in east Africa has been contracting sharply.
一棵橡树一旦长成，就有可能在干旱甚至火灾的小周期中存活下来。
Once an oak tree becomes established, it is likely to survive minor cycles of drought and even fire.
那片现在是沙漠的地区和所有干旱地区一样，对降雨量相对更大或更小的周期极为敏感，因此那里的动植物分布发生了巨大且迅速的变化。
The areas that are now desert were, like all arid regions, very susceptible to cycles of higher and lower levels of rainfall, resulting in major, sudden changes in distributions of plants and animals.
科学家已经发现气候变化会引发周期性的强降水与随后断续的干旱天气。
Scientists have found that climate change can trigger periods of intense rainfall followed by long spells of dry weather.
该中心提供给《卫报》的一份报告显示，降雨来得更短、更迅猛，期间是周期更长的干旱，北方的情况尤其严重。
A report provided by the centre to the Guardian shows rainfall coming in shorter, fiercer bursts, interspersed by protracted periods of drought, particularly in the north.
尼尔森·盖蒙表示，有证据显示，周期性袭击德州的干旱和南美洲沿岸外太平洋的水温变化同时发生，相互关联。
Nielsen-Gammon says there is evidence that the droughts that periodically hit Texas coincide with changes in the water temperature in the Pacific Ocean off the coast of South America.
其中有自然原因：2006年以来，加州一直处于一个周期性干旱中，而气候变化是对州内山区积雪的长期威胁。
Some of the reasons are natural; California has been in one of its periodic droughts since 2006, and climate change is a long-term threat to the state's mountain snowpacks.
1970年代，变成了七年一个周期；1980年代，则是五年一个周期，而到了 1990年代，我们几乎每两年或三年就有一次干旱。
In the 1970s we started having droughts every seven years; in the 1980s they came about every five years and in the 1990s we were getting droughts and dry spells almost every two or three years.
尽管有周期性的干旱，这条3900英里的水道还是因在上世纪夺去成千上万人生命的洪水而闻名。
Despite periodic droughts, the 3, 900-mile waterway is notorious for flooding that claimed hundreds of thousands of lives over the last century.
西南玻利维亚地区，位于3700米高度（超1200英尺），其物种都要能抵抗周期性发生的冰冻和干旱。
The varieties of this region of southwestern Bolivia -- at 3, 700 meters (over 12, 000 feet) -- are resistant to the freezes and droughts that periodically afflict it.
在过去我们习惯了每十年一次大的干旱的气候循环周期。
In the past we used to have regular 10-year climatic cycles which were always followed by a major drought.
这种寄生虫生命周期中需要螺和鱼作为宿主，但是中国干旱地区没有这种螺和鱼。
Thee fluke needs snails and fish for its lifecycle, but there were no such snails or fish in this dry region of China.
下一个烟草周期的全球产量目前保持稳定，不过，最近巴西的洪水和马拉维的干旱天气将会对这些市场产生影响。
Global production for the next crop cycle is currently stable, though recent flooding in Brazil and dryer weather in Malawi will impact those markets.
但是他指出，干旱和降水量的减少对中国这样受季风影响的国家的农业生产也有著重要的影响，但它们不一定都是发生在冷周期。
He noted that drought and less precipitation, which do not always coincide with cold periods, were also significant factors affecting the agricultural production in countries like China.
我已经在我的生命周期，当我有想法捆绑一起走，我已经进行了长时间的干旱。
I've had periods in my life when I've had a bundle of ideas come along, and I've had long dry spells.
中国春季干旱指数大多存在5 ~8年的短周期年际周期变化，12 ~13年、15 ~16年的长周年际周期变化存在于部分区域，个别区域还存在20年长周期年际周期变化。
It is proved that the drought index exists 5 ~ 8 a period in the most areas, it exists 12-13 a and 15-16 a period in some areas, it also exists 20 a period in specific area.
在1961—1962年、1980—1982年、1994—1996年、1999—2000年4个阶段中几乎在所有周期上均表现为负位相，不同周期的振荡同位相叠加，从而形成了春季强的干旱阶段。
In 4 periods of 1961-1962, 1980-1982, 1994-1996, 1999-2000, negative phases appear in the most cycles. The same phase superimposition of the various oscillation cause heavy drought stage in spring.
在1961—1962年、1980—1982年、1994—1996年、1999—2000年4个阶段中几乎在所有周期上均表现为负位相，不同周期的振荡同位相叠加，从而形成了春季强的干旱阶段。
In 4 periods of 1961-1962, 1980-1982, 1994-1996, 1999-2000, negative phases appear in the most cycles. The same phase superimposition of the various oscillation cause heavy drought stage in spring.
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