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Three-and-a-half-year-old Shang Qi and Shang Yao crouched beside a piece of experimental equipment, tilting their little ears to listen to the unusual electrical noise from the machine.
In less than half a minute, there was another strange sound, and the machine stopped working.
Shang Yao patted the machine with his little hand a few times, "What should we do? Is it broken?"
Shang Qi, squatting beside him, nodded, "It seems so."
Hearing this, Shang Yao ...
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