Houghton Mifflin Harcourt, which developed the iPad algebra program in California, said it planned to compare the test scores of students using a textbook in digital and traditional book formats.
加州开发了iPad代数应用的霍顿·米夫林-哈考特宣称，其计划比较使用数字化教科书与传统课本的考试成绩。
It is difficult to integrate development processes that ship in their own propriety format: Every book and publication presents method content and processes that use different formats.
集成以只适于它们自己的格式导入的开发过程是困难的：每本书或出版物中的方法内容和过程都以不同格式出现。
Note: Use the Address Book to specify preferred text formats for recipients.
说明：使用通讯录为收件人指定优先的文本格式。
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