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There are a lot of classic research, design is useless, and I often commit this disease.
Nothing new,
However, this is the difference between air conduction and calcaneal conduction, and the pronunciation of moving circle
A lot of research has been written, but the products have not reflected it at all. besides, where does the gas conduction come from? Isn't it bone conduction?
Isn't that just bone conduction? Is it?
good design
this is good
First time I heard about gas conduction
You are still similar to hkust xunfei you have also investigated so much in the early days or said that hkust xunfei has reached its acme