When in doubt, I find retracing my steps to be a wise place to begin.
如果有问题, 我发现可以根据我的脚迹折回来。
retracing cosine curve.
余弦折回曲线
Notice that in the process of retracing Ive changed all her proportions and made her older than the doodle.
请注意我在重画的过程中不小心把她画得比较成熟。
Which figure CANNOT be drawn without lifting the pencil or retracing.
不用虚线和回描，那幅图不能被画出？
Which figure CANNOT be drawn without lifting the pencil or retracing
如果不重复或不折回, 哪幅图画不出来？
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