turning curve的用法和样例：
例句
- Like a vertex of a polyline, it expresses a point on the object, but it also expresses the shape of the curve at the point.
和折线上的定点类似，它也表示对象上的点，不过这里表示的曲线上的点。 - Architect can choose any kind of grooves,curve diversification or various curving styles with his pleasure.
建筑师可以任意选择凹槽和折线变化或各种曲线造型。
