The input device comprises a plurality of input units, and a plurality of input symbols are correspondingly marked;
输入装置包含多个输入单元，对应标示多个输入符号；
Like input units, output devices are instruments of interpretation and communication between humans and computer systems of all sizes.
与输入设备类似，输出设备也是人与计算机系统之间实现解释和通信的设备。
Like input units, output devices are instruments of interpretation and communication between humans and computer systems of all sizes.
与输入设备类似，输出设备也是人与计算机系统之间实现解释和通信的设备。
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