Most recently, more than 40 states have adopted the Common Core, standards for reading and math that in many cases are much more difficult than previous guidelines.
最近也有超过四十个州采纳了共同核心标准，这套标准对阅读和数学的要求，在很多情况下难度都远超先前的准则。
The new arrangement will add more than 100 textbooks and other titles covering most common arts, math and science fields.
这项新的联手行动将增加100多册教科用书和其它包括艺术、数学和理工类的书籍。
The new arrangement will add more than 100 textbooks and other titles covering most common arts, math and science fields.
这项新的联手行动将增加100多册教科用书和其它包括艺术、数学和理工类的书籍。
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