以下为句子列表：
英文: External hard disks can be purchased alone and then attached to the microcomputer with cables; they are used for backing up large amounts of data or for additional storage capacity.
中文: 内部硬盘永久性地安置在微机内，只有需维修或更换时才取出。外部硬盘可以独立购买，通过电缆线与微机相连。
更详细...
英文: External hard disks can be purchased alone and then attached to the microcomputer with cables; they are used for backing up large amounts of data or for additional storage capacity.
中文: 外部硬盘可以独立购买，通过电缆线与微机相连；它的用处是备份大量的数据或增加存储容量。
更详细...
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