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单词 bore-bit
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bore-bit
bore-bit n. a chisel used in boring through rocks.
ΘΚΠ
society > occupation and work > equipment > cutting tool > chisel > [noun] > boring chisel
boring-bit1844
bore-bit1870
cross-mouth chisel1874
straight bit1883
1870 Spons' Dict. Engin. II. 499 The bore-bit is a simple, flat chisel.
extracted from boren.1
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