It has consequences: South Africa's ongoing drought—the worst in three decades—will cost at least a quarter of its corn crop this year.
它的后果是：南非持续的干旱——三十年来最严重的干旱——将导致它今年至少四分之一的玉米作物受损。
Over the past three decades the number of students leaving home each year to study abroad has grown at an annual rate of 3.9 percent, from 800,000 in 1975 to 3.5 million in 2008．
在过去的30年里，每年出国留学的学生人数以每年3.9%的速度增长，从1975年的80万人增长到2008年的350万人。
Over the past three decades, the number of students leaving home each year to study abroad has grown at an annual rate of 3.9 percent, from 800,000 in 1975 to 3.5 million in 2008．
在过去的30年里，每年出国留学的学生人数以每年3.9%的速度增长，从1975年的80万人增长到2008年的350万人。
The average person takes in a million or more calories per year, maintaining within a narrow range over the course of decades.
一般平均下来一个人一年要摄入一百万甚至更多的卡路里，但是在几十年里体重却一直保持在变化幅度很小的范围中。
Scientists have only become aware of related problems over the past few decades, since this year marks the 25th anniversary of the discovery of the hole in the ozone layer.
数十年后的今天，正值发现臭氧空洞的25周年纪念日之际，科学家才开始意识到相关的问题。
He is talking about the things with feathers and the eggs-some 50m of them each year-that his firm still USES to make flu vaccines, just as the industry has done for decades.
他说的就是鸡和蛋，他的公司如今仍用它们来制作疫苗，年用量大约为5000万只(个)。数十年来，疫苗产业一直都是这么做的。
Yet the pace of depredation has picked up rapidly over the past three decades, as tourist visits have increased 14-fold to over 160, 000 a year.
在过去的30年里，随着旅客人数增长了14倍到达每年16万人次，破坏的步伐也迅速加快了。
Earlier this year, the court reversed many decades of established law to find that corporations have a First Amendment right to spend money in federal elections.
今年早期，法院撤销了数十年的已形成的法律好让公司享有第一修正案的权利以便在联邦选举中花钱。
The only option that preserved salmon populations, at least for a few decades, was to reduce the diversions for hydropower generation at the warmest time of the year, they said.
他们说，至少几十年维持三文鱼数量的唯一可选择的办法是在一年里最热的时间减少为了水力发电而修建的分水渠。
You'd think that they would have cleaned up over the last year, since the disintegration of the financial system in recent months is almost exactly what they have been warning us about for decades.
可能你会认为它们在过去的一年中收益丰厚，因为近几个月金融系统的崩溃与他们在十年前对我们的提醒不谋而合。
It's just that, in defiance of decades of New Year resolutions, it's unlikely to make us slim.
换句话说，正如我们无视十余年的新年心愿一样，它不可能使我们苗条。
Energy consumption grew at nearly 10 percent per year between 2000 and 2005, more than twice the yearly rate of the previous two decades.
2000年至2005年期间，中国的能源消费以平均每年近10%的速度递增，比过去20年的年增长速度快一倍。
The 83-year-old economist noted that such discussions haven't been so prominent in decades — not since the 1971 collapse of the Bretton Woods system of fixed exchange rates.
这位83岁的经济学家指出，自1971年布雷顿森林体系的固定汇率制瓦解后，几十年来从未对货币体系进行如此郑重的讨论。
For the first time, more women than men in the United States received doctoral degrees last year, the culmination of decades of change in the status of women at colleges nationwide.
去年，美国获得博士学位的女性人数首次超过男性，这是数年来美国大学校园里女性地位变化的积累表现。
As most of the world's big economies withered the following year, the market shrank by more than 6%, a rate of decline not seen for decades.
随着世界多数主要经济体随后几年经济的衰退，汽车市场缩水大约6%，这在过去的十几年内是从来没有的事情。
But was it wise of Mr Obama to put such a big thing, such a complicated thing, at the very heart of his presidency in his very first year, in the middle of America's worst recession for decades?
但奥巴马在上任第一年，在美国经济几十年来最萧条的时刻，就将如此宏大、如此复杂的工程作为核心工作，是不是足够明智？
Greece'spopulation has shrunk by more than 1 percent over the last 10 years, accordingto a census carried out earlier this year, thereby bucking the trend of thelast few decades.
今年早些时候的统计结果显示，有悖于过去几十年人口增长的趋势，10年以来，希腊人口已经减少了1% 。
Channels through the Canadian Arctic archipelago that were choked with ice at this time of year two decades ago are now expanses of open water or vast patchworks of tiny islands of melting ice.
两年前通往加拿大北极群岛的海峡的道上满是冰层，而现在已是一片无冰水域或者只是点缀着正在融化的浮冰。
After advancing at a measly 1.5% per year for more than two decades, productivity growth soared to an average of 2.5% a year in the late 1990s and over 3% a year between 2002 and 2004.
在以年均增长1.5%的速度增长了二十多年以后，在1990年代后期生产率增长速度猛增到年均增长2.5%，以及在2002年到2004年之间增长速度超过3%。
The increase in carbon dioxide emissions over the coming few decades will be crucial in determining the sort of climate that the world will live in by the year 2200.
今后几十年里二氧化碳排放的增加，对于确定世界到2200年时所处的气候类型具有至关重要的影响。
Hundreds of midsize asteroids near Earth are discovered every year, but at this rate, it would take decades to locate all of them and see if they pose a threat.
每年都有数百颗中型小行星在地球附近被发现，但按这一速度，还将需要几十年时间。
As just one example, the number of young child deaths worldwide dropped last year to its lowest level in nearly six decades.
例如，去年全世界幼儿死亡数量降至将近六十年来的最低点。
If the roughly 5 percent of all roofs that are replaced each year were given cool colors, he said, the country's transformation would be complete in two decades.
他说，如果每年大概有5%的旧屋顶被替换成“降温屋顶”，那么全美的屋顶改造计划有望在20年内完成。
If the roughly 5 percent of all roofs that are replaced each year were given cool colors, he said, the country's transformation would be complete in two decades.
他说，如果每年大概有5%的旧屋顶被替换成“降温屋顶”，那么全美的屋顶改造计划有望在20年内完成。
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