abacus
noun [ C ] uk/??b.?.k?s/ us/??b.?.k?s/
(COUNTING TOOL)
算盘
a square or rectangular frame holding an arrangement of small balls on metal rods or wires, used for counting or for doing calculations
(IN BUILDING)
architecture specialized(圆柱)顶板
a flat slab (= piece of stone, etc.) at the top of a column


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