Teenagers in Shanghai and Singapore have retained their leading position in an international test of maths, science and reading, according to new results which cast doubt on teaching methods in higher-spending systems such as the UK and US.
一项考察青少年数学、理科和阅读能力的国际测试的最新结果出炉，上海和新加坡的青少年继续保持领先，英国和美国等教育支出较高的国家则被质疑教学方法有问题。
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