Bats fly not by their eyes, but by their ears, and rely on ultrasound waves to locate their surroundings.

The professor once hypothesized that if the frequency of this ultrasonic wave was well controlled, it could be used to identify many solid objects, such as finding pei cui in jade and gold in sand.

Lu Fan looked at the bat in his hand, his eyes were like torches, and he carefully observed how the bat emitted ultrasound.

Now that his Immortal Doctor Treasure Book has reached the power realm, his five senses have been greatly improved, and his comprehension ability has also surged.

If you are an ordinary person, even if you know how bats emit ultrasound, your voice will not be able to make it

Chapter 302 of "Urban Transcendent Divine Doctor" The solution is in the middle of the hand, please wait a while,

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