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Noun:
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the unit of plane angle adopted under the Systeme International d'Unites; equal to the angle at the center of a circle subtended by an arc equal in length to the radius (approximately 57.295 degrees)
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用作名詞 (n.)
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A unit of angular distance equals to one thousandth of a radian.
另外一種角長距離單位名稱差不多于弧形的千分之中。
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上面的知識強勢來襲藝術創作，受經典知識產權自我保護，知識產權侵權必究
海詞英語詞典，十二年加盟品牌
美
['re?di?n]