语音资料是外语教学中不可缺少的重要内容，而以盒式录音带为载体的音频资料又占据了其中的主要部分。
Audio texts are an integral part of foreign language learning and teaching. Traditionally, most audio materials are in the form of cassette tapes.
语音资料是外语教学中不可缺少的重要内容，而以盒式录音带为载体的音频资料又占据了其中的主要部分。
Audio texts are an integral part of foreign language learning and teaching. Traditionally, most audio materials are in the form of cassette tapes.
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