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... only he could hear, and when he saw the screen, it was a video phone similar to the ancient earth.
The bookstore was relatively quiet, Bai Ruogu didn't want to disturb others, and was about to get up and go out, but suddenly thought of the common sense he had just learned.
He looked at the button on the table and pressed it tentatively. After a while, a transparent glass cover covered him, temporarily isolating the sound inside and outside.
He looked at it a few more times ...
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