线条二:双点线。
The line cuts the circle at two points.
那条线与圆相交于两点。
So, OK, it's pretty good because we have two points in that line.
这非常好,因为我们有了直线上的两个点。
It creates as a distance between two points, rather than a straight line, an arabesque.
它加长了两点之间的距离,使它变得非直而曲。
Now there many ways I can connect these two points together. The simplest way is to draw a straight line. It's called the linear interpolation. My line is not so straight, right here. You could do a different kind of line.
最简单的办法是,像这样画一条直线,这叫线性插值,不过我的这条线画得不太直,你也可以用别的办法,比如一条抛物线。
I don't know how well you can see it in this figure here, is the slope of a straight line connecting these two points, and as the points come closer and closer, the straight line would become tangent to the curve.
我不清楚你们对于这个图像的理解,这条连接两点的斜线,随着两点距离逐渐缩小,两点连线会变成曲线的切线
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