Each unit is supported by audio material in range of accents, available on audio CD or cassette.
每个单位的支持，音频素材，在一系列的口音，可在音频CD或录音带。
2
Most computer sys tems have some way to store information permanently, whether it is on cassette tapes, floppy disks, or hard disk fixed inside the system unit.
Most computer systems have some way to store information permanently, whether it is on cassette tapes, floppy disks, or hard disk fixed inside the system unit.