Boerdijk-Coxeter helix
plural of tung
(geometry) A linear stacking of regular tetrahedra, arranged so that the edges of the complex that belong to only one tetrahedron form three intertwined helices.
(mineralogy) A dull brown or yellow triclinic mineral.
simple past tense and past participle of trump up
会議で彼女は、正四面体を直線状に積み重ねた構造（複合体のうち一つの四面体にしか属さない辺が三本の絡み合う螺旋を形成する配置）と、それが新しい四面体骨格の設計に果たす役割について詳細な講演を行った。
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