Any of the four areas into which a plane is divided by the reference axes in a Cartesian coordinate system, designated first, second, third, and fourth, counting counterclockwise from the area in which both coordinates are positive.
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释义
象限在笛卡尔坐标系中,被坐标轴分开的平面中的四个区域的任一个,命名为第一,第二,第三和第四,从此象限逆时针计算坐标为正数
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