以上来源于: WordNet
leaning tower of pisa 比萨斜塔（位于意大利比萨古城内的教堂广场上）
Pisa is a small city.
比萨是个小城市。
youdao
It is famous for the leaning tower of Pisa.
它以比萨斜塔而闻名。
If you think that Pisa has only one leaning tower, you may just be wrong.
如果你认为比萨只有一座斜塔，那你可能就错了。
The OECD has the Program for International Student Assessment, or PISA.
VOA: special.2009.07.30
Every three years PISA measures the performance of fifteen-year-olds.
The Pisa tests have become a key part of an increasingly global perspective on education standards.
BBC: Schools can measure themselves against Pisa tests
The PISA assessments of 15-year-olds show Wales falling further behind since the 2006 tests.
BBC: Children and Young People Committee
Chinese students from Shanghai and 11 other regions did very well in the 2009 PISA TEST.
FORBES: China's Achilles Heel: Education System
PISA（Programme for International Student Assessment）(国际学生评估项目的缩写）是一项由经济合作与发展组织（Organization for Economic Co-operation and Development，OECD）统筹的学生能力国际评估计划。主要对接近完成基础教育的15岁学生进行评估，测试学生们能否掌握参与社会所需要的知识与技能。
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