The seat material shall be one of the following materials: ethylene-propylene-diene monomer (EPDM) or fluoroelastomer (FPM) with polytetrafluoroethylene (PTFE) bearing support at the top and bottom.是什么意思_The seat material shall be one of the following materials: ethylene-propylene-diene monomer (EPDM) or fluoroelastomer (FPM) with polytetrafluoroethylene (PTFE) bearing support at the top and bottom.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句