求翻译：同时正投影的图形简单、准确、度量性好。如碰到家具中的若干曲面造型则采用通常采用异形轮廓测量的方法。家具的腿形以及异形构建等等，都离不开曲面立体的画图问题[4]。曲面立体常见的有圆柱、圆锥、圆球和圆环，但是实际中，往往不是一个完整的曲面立体，而是其中的一部分，使用定点连线。是什么意思？

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Simultaneously the normal projection graph simple, accurate, the measure is good.If bumps into in the furniture certain surface modeling to use usually uses the different shape outline survey the method.Furniture leg shape as well as different shape construction and so on, cannot leave curved surfac

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Projection is the graphics simple, accurate, and metrics. As with furniture, a number of curved styling is often used with different-shaped contour measurement method. furniture legs, as well as different-shaped building, and so on, are inseparable from curved three-dimensional animation ( 4). There