ruler
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The ruler of a country is the person who rules the country.è¯æ³ä¿¡æ¯
...the former military ruler of Lesotho...
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2.N-COUNTå°º;ç´å°ºA ruler is a long flat piece of wood, metal, or plastic with straight edges marked in centimetres or inches. Rulers are used to measure things and to draw straight lines.
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