一般由磨料、结合剂和气孔构成，这三部分常称为固结磨具的三要素。
Generally abrasive, bond and pore structure, these three parts are frequently referred to as consolidation of the three elements of abrasive.
这个富有创造力的天花板使用了一般用于通风管道标准的通风布料制造，通过这种织物就能直接为室内提供平滑的气流，而不需要借助其他排气孔。
The innovative ceiling is manufactured with standard ventilation cloth, normally used for ventilation ducts. This provides a smoother airflow directly through the fabric, without any vents.
通过模拟，给出基模损耗同芯折射率、光波长和包层空气孔直径之间的一般规律。
After the simulation, the relationship of fundamental mode loss with the core index, wavelength and the diameter of cladding air holes is given.
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