Thus, we give a make-graph method of conic section on plane with arbitrary point as foci, arbitrary line as directrices and arbitrary positive number as eccentricity.
从而给出了以平面上任意点为焦点、任意直线为准线，任意正数为离心率的圆锥曲线的直接作图方法。
2
We have obtained foci of transformed NIH3T3 cells through transfection of human DNA from CNE-2 (an undifferentiated epithelial cell line of nasopharyngeal carcinoma).