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Different sound wave patterns represented different materials.
The pattern of sound waves traveling through air was entirely different from that of sound waves moving through soil.
This was the convenience of using modern archaeological instruments.
Old Yao and Professor Qi looked at each other.
A hint of pride and arrogance appeared on Professor Qi's face, accompanied by a smile.
Old Yao, on the other hand, was delighted: "Keep probing, keep probing, ...
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