Members of Parliament making a point of order in the House of Commons wear a collapsible opera hat and nobody sniggers. 在下议院，提出程序问题的议员们戴一种折叠式的大礼帽也无人窃笑。
The fold cartridge filter unit was developed by adopting hitech membrane material, and then a new type of gassolid separation equipment was made up with it. 采用高科技膜材料研究制成折叠式滤筒过滤单元，并组合形成一种新型的气固分离设备。
