1·According to the conventional view, liquid water has a similar, albeitless rigid, structure, in which extra molecules can pack into some ofthe open gaps in the tetrahedral arrangement.
根据传统观点，液态的水分子也是类似排列，尽管不那么严格，额外的分子会被包进四面体孔隙里。
2·His work with tetrahedral kites led to the development of this flying machine a few years before 1910.
1910年前，他在四面体风筝方面的研究，导致了这艘飞行器的开发。
3·John McCurdy pilots Alexander Graham Bell's experimental tetrahedral kite, the Cygnet III, which left the ground via powered flight in March 1912.
1912年3月，约翰·麦柯迪试驾亚历山大·格雷厄姆·贝尔的实验性四面体风筝，通过动力飞离地面的“小天鹅3号”。
4·A satisfactory theory must be able to explain why in methane the HCH angles all have the characteristic tetrahedral value.
一个完满的理论必须能够解释甲烷中为什么所有hch角都具有四面体的特性值。
5·Unstructured tetrahedral meshes are used to simulate the flow field inside high pressure combined valves of a 600mw ultra supercritical steam turbine under the nominal condition.
采用非结构化四面体网格，对某600 MW超超临界汽轮机组高压主汽调节联合阀的额定工况进行了数值模拟。