Radio teaching was used extensively during the early days of distance education to provide lectures to students who were not physically present in a classroom.
在远程教育的早期，广播教学被广泛使用，为不在教室里上课的学生提供讲座。
Students tuned in to the radio at home to listen to their history lessons broadcast by the university.
学生们在家中收听大学广播的历史课程。