The hardest metal VS the strongest drill bit,
Original title: The hardest metal VS the strongest drill bit, the process is so wonderful, the result is a big surprise! In Fukuoka Prefecture, Japan, there is a company called Tungsten Company, which claims to produce the hardest metal in the world, and no drill can drill holes in it. Words are full, afraid of breaking the tongue. A Japanese company that produces drill bits is not convinced....
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