然后你将会一直绕另一辆车转，但当你从上面看，你们两个一直在向前行驶且你们的路径是凸形的。
You will then be making circles around the other car, but when seeing from above, both of you are driving forward all the time and your path will be convex.
线性误差曲线可以是凹形曲线，也可以是凸形曲线。
Linear error curve can be concave curve, it could be a convex curve.
伸展方式对于凹形边界和凸形边界具有不同的影响。
Stretch manner has different influences on concave boundary and convex boundary of a model.
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