Like input devices, output devices are instruments of interpretation and communication between humans and computer systems.

像输入设备，输出设备都是人与电脑系统之间互相联系和解释的工具。

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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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Second, newer approaches to CAPTCHA have been developed that try a different approach to a Turing test by asking users to perform operations through input devices, like a keyboard or mouse.

FORBES: Artificial Intelligence Will Defeat CAPTCHA -- How Will We Prove We're Human Then?