| 词汇 | tetrahedron |
| 词根词缀 | 词源： solid figure contained by four triangular surfaces, 1570, from Late Gk. tetraedron, originally neuter of tetraedros (adj.) "four-sided," from tetra- "four" + hedra "seat, base, chair, face of a geometric solid," from PIE base *sed- "to sit" (see sedentary). |
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