... 周道积分 contour integral 等高线；平准线；等直线；轮廓线 contour line 周道映射；等高线图 contour map ...
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一旦创建了画布部件实例，其上就可以创建一些标准的图形对象(例如，直线、圆形、长方形等)。
Once a Canvas widget has been instantiated, several standard graphical objects (such as lines, circles, rectangles, and others) can be created on it. The following program demonstrates this.
我们主要还是关注，参数方程的运用，主要是一维的，比如直线、曲线等。
So, we have mostly focused on the use of parametric equations just for one dimensional objects, lines, and curves.
这种新标记是一个画布，可以在其上绘制直线和矩形、放置图片、进行旋转等。
This new tag is a graphics canvas on which you can draw lines and rectangles, place images, perform rotations, and more.
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