The capital's schools have been held up as a showcase of rising standards.
现在首都的学校通常会都被视为一种高标准的展示。
But the University College London (UCL) Institute of Education study, using OECD Pisa test results, suggests they are weaker than those in many Asian cities and the rest of the UK.
但是，伦敦政经教育研究所的OECD PISA测试结果显示，伦敦的学校要比亚洲城市和英国其他地区的学校差很多。
However, the OECD's education director, Andreas Schleicher, has rejected the findings as "not credible".
不过，OECD教育主任安德烈亚斯·施莱克尔已经否认了该项研究结果，称它并不可信。
Mr Schleicher says the London schools taking the Programme for International Student Assessment (Pisa) tests were not intended to be representative of the greater London area and such comparisons were invalid.
施莱克尔表示，参与国际学生评估项目的伦敦学校无法代表广大的伦敦地区，所以这样的比较是无效的。

But academics at the UCL Institute of Education say they have produced a robust sample of 42 schools by combining the results of two year groups taking the tests in London in 2009 and 2012.
但是伦敦政经教育学院的学者却称，他们庞大的样本群体是由42个学校组成的，并且结合了2009年和2011年两年间参加测试的伦敦学校的数据结果。
The analysis compares these London results, in reading, maths and science, with the performance of 15-year-olds in cities, regions and countries around the world. It suggests if London entered the Pisa tests as a separate education system, pupils taking maths would be three years behind their counterparts in Shanghai, which has the world's top-ranking results.
该研究将伦敦15岁青少年的阅读、数学和科学能力测试结果与世界其他城市、地区和国家的同龄人同领域能力测试结果进行了比较。结果显示，如果伦敦作为一个独立的教育体系参与PISA测试，参与数学测试的学生要比上海同龄人落后三年，上海学生在该领域世界第一。
And as well as being behind high-flyers in maths such as Singapore, Hong Kong, Finland and Poland, teenagers in London were below the level of counterparts in countries such as Spain, Italy, France, Slovenia and Latvia. For reading, the analysis put London behind Madrid in Spain, Riga in Latvia and Massachusetts, the highest-achieving state in the United States. In science tests, London would be above the US state of Florida and Buenos Aires in Argentina, but behind Moscow in Russia and Quebec in Canada.
此外，伦敦学生也落后于像新加坡，香港，芬兰和波兰这样的数学强势地区的学生，同样也落后于西班牙，意大利，法国，斯洛文尼亚和拉脱维亚的同龄人水平。在阅读方面，分析显示，伦敦落后于西班牙马德里，拉脱维亚里加和马萨诸塞州。而马萨诸塞州在该领域全美排名第一。在科学测试中，伦敦超过美国佛罗里达州和阿根廷布宜诺斯艾利斯州，但是落后于俄罗斯莫斯科和加拿大魁北克。
And in all three subjects, London was far behind the school systems of Shanghai, Hong Kong and Singapore.
在所有这三项学科中，伦敦远远落后于上海，香港和新加坡的学校。
The report also suggests London schools were below the UK national average, with girls and disadvantaged and ethnic minority pupils in London performing less well at Pisa tests compared with their GCSE results.
该报告还指出，伦敦学校的教育水平低于英国平均水平，伦敦女孩、残疾儿童和少数民族学生在PISA测试中的表现比在GCSE中差。