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日本专家发明了一种电子电话簿。它实际上是一个直径12厘米的磁盘,里面储存了一百多万个电话号码,其容量相当于四本普通电话簿。借助于小型电
Japanese experts invented an electronic phone book. It is actually a 12-centimeter-diameter disk containing more than a million phone numbers and a capacity of four ordinary phonebooks. With small appliances