The unit is mainly used in producing polythene screw-thread bellows.The bellows are mainly used in the case shell protection of cable, transfer line ,gas pipeline for industry and civil use.是什么意思_The unit is mainly used in producing polythene screw-thread bellows.The bellows are mainly used in the case shell protection of cable, transfer line ,gas pipeline for industry and civil use.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句