Synchronizes the feed of upper and lower layers of material by top and bottom feeding mechanism while sewing in flationary materials and latently movable materials of medium and heavy weight.是什么意思_Synchronizes the feed of upper and lower layers of material by top and bottom feeding mechanism while sewing in flationary materials and latently movable materials of medium and heavy weight.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句