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扩孔
擴孔
kuòkǒng
1. to widen a tube
2. to ream (i.e. widen a hole)

Character Breakdown

扩
kuò
to expand, to stretch, to magnify
HSK 5 6 丶
孔
kǒng
opening, hole, orifice; great
HSK 6 4 丶

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Category
Chinese