The door and parts of the fixed part may be made of perforatedsheet metal.
门 和固定部分的多个部分可由穿孔金属板制成。
2
An acoustically absorbent material (e. g. a fabric) may be secured to an inwardly facing surface of any part formed from perforatedsheet metal.
吸音材料(例如织物)可固定至由穿孔金属板形成的任何部分的面向内的表面。
3
Inner space is without paint and exposes a texture of concrete. Interior wall attached to the lecture pavilion is an acoustic wall and is made of veneered perforatedsheet.