常見例句雙語例句Check valve and butterfly valve combinations are very popular; normally a short spool piece is required between the valves.止回閥與蝶閥的連接是經(jīng)常發(fā)生的事，通常需要在這兩種閥門之間加上一節(jié)短短的閥槽。Items that are not compatible should be removed from the system and replaced with a blank, valve, spool piece, or temporary jumper hose.不配伍的任何零件應從系統(tǒng)中移開并以間隙、閥、管段或者暫時的跨接軟管替代。The product is portable and flexible. There are receding groove every one inch in the steel column, assembling with protruding coil of spool piece.輕便靈活，鋼柱每隔一英吋凹入溝圈與接管片凸出線圈配合組裝。權威例句Besides the vegetables, they held a piece of bread, a pocketknife, sometimes the Alpine Club guidebook, and always a spool of wire for emergency repairs.NEWYORKER: Bear Meat 返回 spool piece