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英语翻译A solid tetrahedron is sliced off a wooden unit cube by

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英语翻译
A solid tetrahedron is sliced off a wooden unit cube by a plane passing through two nonadjacent vertices on one face and one vertex on the opposite face not adjacent to either of the first two vertices.The tetrahedron is discarded and the remaining portion of the cube is placed on a table with the cut surface face down.What is the height of this object?
在一个正立方体上,过其三个顶点切掉一个四面体.其中有两个顶点共面且不相邻;另一个顶点在前两个顶点所在平面的对立面上,且与前两个顶点都不相邻.
将剩余部分放在水平桌面上,切割面朝下,那么这个物体的高度是多少?