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单词 persian drill
释义

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Persian drill
Persian drill n. Obsolete rare a hand drill operated by moving a nut backward and forward along the long-pitched thread of a screw which carries the drill, which is thereby forced to revolve in alternating directions.
ΚΠ
1875 E. H. Knight Amer. Mech. Dict. III. 1671/2 A hand-drill..sometimes known as the Persian drill..is frequently used for fine work and in dentistry.
extracted from Persiann.adj.
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