具有某种共同属性的圆的集合，称为圆系。 几种常见的圆系方程： （1）同心圆系： （x－x0）^2+（y－y0）^2=r^2，x0、y0为常数，r为参数。 （2）过两已知圆交点： C1：f1（x，y）=x^2+y^2+D1x+E1y+F1=0。 和C2：f2（x，y）=x^2+y^2+D2x+E2y+F2=0的交点的圆系方程为： x^2+y^2+D1x+E1y+F1+λ（x^2+y^2+D2x+E2y+F2）=0（λ≠－1） 若λ=－1时，变为（D1－D2）x+（E1－E2）y+F1－F2=0，
... syntactics 符号关系学 system of circles 圆族; 圆系 Systematic error, 系统误差 ...
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老人正坐在他那上下颠倒的弹簧床上： 精细的圆腿直指天空，系在木框上的绳子已被打湿。
THE old man was sitting on his string bed. But it was upside down; its finely rounded legs were pointing to the sky, and the knotted ropes strung across its wooden frame were wet.
科学家发现，它们是如此的圆，以至于，如果将其尺寸放大到太阳系大小，它仍将是一个误差不超过头发丝粗细的圆。
Scientists found that they are so round that if it was magnified to the size of the solar system, it would still appear spherical to within the width of a human hair.
老人正坐在他那上下颠倒的弹簧床上： 精细的圆腿直指天空，系在木框上的绳子已被打湿。
THE old man was sitting on his string bed. But it was upside down;
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