For electric arc welding in a space with conductive walls or floors, the welder should be provided with an insulating mat or cradle to avoid bodily contact with the walls.是什么意思_For electric arc welding in a space with conductive walls or floors, the welder should be provided with an insulating mat or cradle to avoid bodily contact with the walls.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句