The most extensive use of tapes is perhaps the subliminal learning method, in which students listen to recorded materials in their sleep.
這也是為什麼各大學語言學院的「高級聽講課」，一定要老師指導的原因。視聽教具雖不可靠，但多少總有些「剩餘價值」吧！借助語言學習機，趁著在睡眠時「偷襲」如何？