正交两圆柱的相贯线，一般是四次曲线。
The intersection of two right circular cylinders is usually quartic curve.
重虚圆点四次曲线是很重要的一类高次平面曲线。
Bicircular quartic is a very important classics of higher plane curves.
上述四种拟合方式的动校正结果优于四次曲线拟合方式动校正结果。
The NMO results of theoretical records showed above mentioned NMO results of four fittings are superior to that by four-order curve fitting.
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