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geometry 几何 a quarter of a circle or of its circumference (= the distance around it) 四分之一圆（或圆周）；象限 
an instrument for measuring angles, especially to check your position at sea or to look at stars 象限仪，四分仪（常用于测量海上方位或观看星辰）
Word Originlate Middle English (denoting the astronomical instrument): from Latin quadrans, quadrant- ‘quarter’, from quattuor ‘four’.