number system
(UK, informal) to rain heavily.
(arithmetic) A set of numerals for representing numbers.
Having no ancestors, or no ancestors of social importance.
The game played by throwing horseshoes toward a metal stake.
古代エジプト人は貿易や天文学のために数量を記録する目的で、ヒエログリフに基づく記数法を発達させました。
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