超等四轮节造体系 SQQAWC
等轴四半面体 isometric tetrahedral hemihedral class
非四边形等离子体波导 nonguadratic plasma waveguide
四团体标准：由相关协会、公会等专业团体制定或采用之标准。
Group standard: a standard that is established or adopted by a professional association or body.
本文论述了姚名达关于编目的思想，主要论述了编目的八点宗旨、四种提要(叙录体、注释体、传录体和辑录体提要)，主题标引的五原则等。
This article summarizes the primary views on bibliography coming from Yao Mingda, which include eight purposes of catalogue, four kinds of abstracts, and five principles of subject heading.
CXF卧式系列数控车方机床能够高效率、高精度地完成车削多棱体及四方、六方等多面工件的加工。
The CXF horizontal series of CNC machine can turn and mill polyhedron and contrate parts with high efficiency and precision.
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