为了得出这一数字，该份研究调查了母亲们的工作岗位和工作时长。
The study looked at the range of jobs mothers do, as well as the hours they are working, to determine the figure.
在许多欧洲国家，近年来随着柴油车日益普遍，这一数字达到了好几万人。
In many European countries, where diesel vehicles have become more common in recent years, that number reaches tens of thousands.
曾经有超过五千对白头海雕在全国各地筑巢，但到了1960年这一数字已降至四百以下。
Once, more than fifty hundred pairs of bald eagles nested across the country, but by 1960 that number had fallen below four hundred.
相比之下，夏洛特的贫困儿童中，跻身上层的人仅有4.4%；而底特律这一数字为5.5%。
By contrast, just 4.4 percent of poor kids in Charlotte moved up to the top; in Detroit the figure was 5.5 percent.
SAT分数从1963年开始下降；今天，平均有30%的学生没有在四年内完成高中学业，这一数字在贫穷的城市社区达到了50%。
SAT scores began dropping in 1963; today, on average, 30% of students do not complete high school in four years, a figure that rises to 50% in poor urban neighborhoods.
据英国《每日新闻》引用的少数科学家的话说，这一数字相当高
Quite a lot, according to a handful of scientists quoted in the News Feature.
这一数字与发达国家平均70%至80%的利用率形成鲜明对比。
This figure stands in sharp contrast to developed countries' utilization average of 70-80 percent.
到2005年，80%的美国家庭将拥有电脑，而现在这一数字只有大约50%。
80% of US homes will have computers in 2005, compared with roughly 50% now.
在消费者中，只有18%的人意识到生态时尚的存在，这一数字相比四年前的6%有所上升。
Among consumers, only 18% are aware that eco-fashion exists, up from 6% four years ago.
如今，英国28%的本科毕业生在从事无需本科学历的工作，这一数字是经合组织成员国平均水平的两倍。
Today, 28 per cent of graduates in the UK are in non-graduate roles, a percentage which is double the average among the OECD countries.
2001年有1031人参加汉语考试，去年这一数字为2062人，而选修西班牙语的人数为2561人。
1031 people took Chinese language exams in 2001, and the number was 2062 last year, while 2561 people chose Spanish.
新加坡国立大学的统计数字显示，超过40%的学生在学期间被迫工作，而在放假期间，这一数字增加到90%。
NUS statistics show that over 40% of students are forced to work during term time and the figure increases to 90% during vacating periods.
这次爆炸将大约100万亿吨的尘埃提升到大气中，这一数字可以通过测量这些尘埃降落到地表时所形成的沉积层的厚度来确定。
The explosion lifted about 100 trillion tons of dust into the atmosphere, as can be determined by measuring the thickness of the sediment layer formed when this dust settled to the surface.
此外，这一数字并没有反映出一个事实，即大量的土地、能源、化肥和水也在食品生产过程中流失了，而这些食品最终只是被浪费掉了。
Furthermore, this figure does not reflect the fact that large amounts of land, energy, fertilisers and water have also been lost in the production of foodstuffs which simply end up as waste.
有迹象表明这一数字在微微上涨。
其他因素还可能扩大这一数字。
而美国的这一数字是45000美元。
在哈佛和斯坦福大学，这一数字甚至更高。
在较贫穷的国家中，这一数字可能还要高。
这一数字与2001年相比要高出60倍。
随着更多化石的发现，这一数字普遍被接受。
With the discovery of more fossils, that has become the accepted number.
但多数经济学家对这一数字持大体乐观看法。
But most economists took a broadly optimistic view of the figures.
随着住房市场不断走弱，这一数字还会上升。
With housing showing renewed weakness, that number may rise.
欧洲大陆的这一数字则要低得多。
这一数字占到了市场总量的四分之一。
Financially, that figure commands more than one-quarter of the total market.
然而，就这一数字已经让当地居民精疲力尽了。
在欧洲和日本，这一数字为60%左右。
但这一数字掩饰了轿车销量的大幅下滑。
But that figure masked a sharp decline in passenger car sales.
在接下来的四年里，这一数字达到了58。
在过去的十年间，这一数字又提高了51%。
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