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n.四分之一圆( quadrant的名词复数 )；扇形体；象限仪；四分仪 英英释义： quadrant[ 'kwɔdrənts ]n.a quarter of the circumference of a circle同义词：right anglea quarter of the circumference of a circle同义词：quarter-circleany of the four areas into which a plane is divided by two orthogonal c
