短语词组短語Flat fell seam attachment 平縫裝置flat coal seam 水平煤層flat -seam 平縫flat lock seam joint 平麪鎖縫接頭flat fillet seam 平角銲縫flat fell seam 保險縫;明包縫;平拼逢flat lock seam 槽縫flat butted seam 對頭接縫;對接縫;對頭接縫英語;繙譯flat felled seam 明包縫 返回 flat seam