2000年到2008年，用购买力平价计，非洲年产出增长4.9%，是上世纪八、九十年代的两倍，也高于全球平均水平3.8%。
In 2000-08 Africa's annual output grew by 4.9% (adjusted for purchasing-power parity), twice as fast as in the 1980s and 1990s and faster than the global average of 3.8%.
Twitter没有公布过自己的用户数或流量，但在八月份的时候，其共同创始人Biz Stone曾告诉我，Twitter的服务在“过去10个月里，增长了六倍。
Twitter doesn't release its own user or traffic figures, but co-founder Biz Stone told me in August that the servicehad"grown six times over in the last 10 months.
申请硕士和博士等高学位的留学生数量剧增，自上世纪九十年代中期以来增长了八倍多。
The number of overseas students taking higher degree courses, such as masters and doctorates, has soared - rising more than eightfold since the mid-1990s.
据估计，生产单位卡路里热量的牛肉，需要八倍以上的谷物饲料，而且肉类消费的增长会引起对谷物需求的乘数效应。
Producing a single calorie of beef can, by some estimates, require eight or more calories of grain feed, and expanded meat consumption therefore has a multiplier effect on demand for grains.
去年，Facebook在巴西增长了八倍，用户数达到了800万，Or kut则是2800万。
In the last year, Facebook has grown eightfold, to eight million users, in Brazil, where Orkut has 28 million.
压力同时也对教师的工作能力产生了负面影响，超过四分之一(26.1%)的教师由于压力，在去年的12个月中至少请一天假，比2006年的调查结果增长了一倍，当时只有八分之一(13%)的教师由于工作压力，请一天假。
This has doubled since teachers TV's last poll on stress, carried out in 2006. At the time just over one in eight (13%) teachers had taken a day off work as a result of stress.
过去八年里，保险金的增长速度是工资增长速度的四倍。
In the last eight years, premiums have grown four times faster than wages.
过去八年里，保险金的增长速度是工资增长速度的四倍。
In the last eight years, premiums have grown four times faster than wages.
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