广播电视英语短句 第 8 课：数字教科书-3

Earlier this year, California invited content developers to offer digital math and science materials for high schools. 今年早前，加利福尼亚邀请了内容开发人员为高中提供数学和科学的数字版教材。

These had to meet at least ninety percent of the state's learning requirements. 那些教材必须至少达到国家学习要求的90%.

Specially trained teachers examined sixteen textbooks and approved ten of them. 受过专门训练的教师审核了16本教材，通过了其中的10本。

Six of the ten were published by the CK12 Foundation. 这10本中的6本是由CK12基金会出版的。

Co-founder Neeru Khosla says the nonprofit group had been developing digital science and math books for about two years. 共同创始人Neeru.科斯拉说，这一非盈利组织已经开发了大约两年的数字版科学和数学教科书。