...平面曲线;几何应用;复数方法;麦比乌斯变换 [gap=723]ords:Complex numbers; Complex numbers operation; Collected points on the level; Curves on the level ; Geometric application; Complex numbers’ methods; Mobius Mappings ..
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OK, so that's where we use, actually, the labels on the level curves that tell us whether things are going up or down.
这就是用标记在等高线的地方，这些标记将告诉我们，到底是在上升还是下降。
So, a topographic map, this one from the US geological survey shows you, basically, all the level curves of an altitude function on a piece of land.
这是一幅由美国地形勘测出来的地形图，基本上，所有海拔等高线在一块陆地上。
The Canvas API is a low level API for drawing. It lets you create lines, curves, polygons, and circles and fill them in with colors, gradients, and so on.
Canvas API是一个低级画图api，它支持创建直线、曲线、多边形和圆圈，并用彩色、渐变色等填充它们。
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