| 单词 | tetrahedron |
| 释义 | tetrahedron noun[C] mathematicsspecializeduk/ˌtet.rəˈhiː.drən/us/ˌtet.rəˈhiː.drən/pluraltetrahedronsortetrahedrauk/-drə/usasolidshapewhose foursurfacesaretriangles 四面体，四面形（一种立体图形，有四个三角形平面）Geometrical shapes
tetrahedron| American Dictionarytetrahedron noun[C] us/ˌte·trəˈhi·drən/pluraltetrahedronsortetrahedraus/ˌte·trəˈhi·drə/geometry asolidshapewith fourflat,triangularsurfacesofequalsize Examplesoftetrahedrontetrahedron In the first case, thetetrahedronis skinny, and we distinguish five types depending on how its vertices cluster along the line. From theCambridge English Corpus Think of two congruent tetrahedrons made of differently pliable material. From theCambridge English Corpus We can even use (3.10) to define the local spaces for any diffeomorphic image of atetrahedron. From theCambridge English Corpus We shall identify these curves, which might be thought of as forming a supporting framework for thetetrahedron. From theCambridge English Corpus The upper bound is based on a new charging scheme which assigns eachtetrahedronof minimum volume to one of its four faces. From theCambridge English Corpus We normalize by scaling tetrahedra to unit diameter. From theCambridge English Corpus The sliver is the only type of small volumetetrahedronwhose circumradius over shortest edge length ratio does not grow with decreasing volume. From theCambridge English Corpus In particular, the analysis is based on the singularities of these tetrahedra. From theCambridge English Corpus Analysis that is based on the geometry of the tetrahedra have been also presented21 for a class of parallel manipulators with three legs. From theCambridge English Corpus This section introduces polyhedra and studies the problem of how many tetrahedra are needed to mesh them. From theCambridge English Corpus We assume that every triangle in the mesh is the face of atetrahedronin the mesh. From theCambridge English Corpus Another benefit of a mild weight assignment is that it does not drastically change the shape of triangles and tetrahedra. From theCambridge English Corpus In thetetrahedroncase, is one vertex and is thetetrahedronspanned by the other four vertices. From theCambridge English Corpus We do not consider tetrahedra with infinite elements, since they do not have a physical meaning. From theCambridge English Corpus We will see later that meshes of tetrahedra with small ratio also have nice combinatorial properties, such as constant size vertex stars. From theCambridge English Corpus These examples are from corpora and from sources on the web. Any opinions in the examples do not represent the opinion of the Cambridge Dictionary editors or of Cambridge University Press or its licensors. |
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