这主要基于共同核心，还有现行的加利福尼亚州标准。

These are based largely on the common core, but also existing California standards.

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截止到四月份，缅因州是第42个接受《共同核心州立标准》的州。

In April, Maine became the forty-second state to approve the common core standards.

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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。

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.

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