矢量作图更像是用铅笔画画，先拿铅笔确定一些点，然后用直线、曲线、方框和椭圆框连接这些点。
A vector drawing is like a pencil drawing where you take a pencil from one point to another and connect the points with straight lines, curved lines, rectangles, and ellipses.
在等的时候，利用所得数据，手绘或用个人电脑作图。跟助教讨论一下你的滴定曲线。讨论一下接著的滴定分析要否要作改变。
While waiting, plot your data by hand or use your PC. Review your titration curve with your ta. Discuss any changes which should be made for subsequent titrations.
在此基础上，提出了简便、实用的圆锥曲线公切圆作图法。
On this basis, a practical simple way to construct by the conical curves the common tangent circle is presented.
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