used at the beginning of a business letter, etc. to introduce the subject that it is about; used on an email that you are sending as a reply(用于商业信函等开头介绍主题或回复电子邮件)关于,事由
a school subject in which students learn about different religions (the abbreviation for ‘religious education’) 宗教教育(全写为 religious education,学校里讲授不同宗教知识的课程)