a crescent-shaped figure formed on a sphere or plane by two arcs intersecting at two points
月牙形,弓形。
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lunen.月牙形;弓形
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linen.线;绳;行;一排人;行业;行当;防线;战线;一行;直线
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lungn.肺;空气新鲜的空旷地
"early 18th cent.: from French, from Latin