◎ 套管 tàoguǎn
[casing pipe] 套在另一部件上的管子

1.drivepipe; annular tubes; branch pipe; casing pipe; sleeve; sleeving; canula; cannula; casing; cothead; spigot; nozzle; connection; bushing （电瓷）; casing (drill hole) （钻孔）