Keyboard input method can modify the electronic time clock.

能用键盘输入的方法修改电子时钟的时间。

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A clock signal input is designed to supply a clock signal.

时钟信号输入端被设计用于提供时钟信号。

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A clock signal input is designed to supply a clock signal.

时钟信号输入端被设计用于提供时钟信号。

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