在这个时候，拓扑学被称做位置几何学。
At this time the subject of topology was known as analysis situs.
在这个时候，拓扑学被称做位置几何学。
At is time the subject of topology was known as analysis situs.
画法几何学中的难点之一是求解两一般位置二次曲面的交线。
One of difficulties in descriptive geometry theories is to draw the intersection created by two general position intersecting quadric surfaces.
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