“purlin”的概念、定义、翻译、参考文献-科学参考

单词	purlin
释义	purlin [`pǝr·lǝn] ^{BUILDING CONSTRUCTION} A horizontal roof beam, perpendicular to the trusses or rafters; supports the roofing material or the common rafters.
随便看	space modulation space motion space navigation space perception space permeability space polar coordinates spaceport space power system space probe space processing space quadrature space quantization spacer spacer block spacer deoxyribonucleic acid space reconnaissance space reddening space reflection symmetry space request space research spacer strip space satellite space ship space shuttle space simulator

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