The final layer is a soft rubber compound, which acts as a cushion.
而最下面一层则是种柔软得橡胶, 起到缓冲得作用。
the upper layer of the cushion body is covered with a jade slip and blade cushion connected by jade blocks.
于垫体的上覆上一层由玉石块连接而成的玉片垫。
Analysis on Seismic Response of Penstock with Cushion Layer Outside Replacing Expansion Joints In Zipingpu Water Conservancy Project
紫坪铺水利枢纽垫层管取代伸缩节的地震响应分析
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