单词	backing ring
释义	backing ring noun : a metal ring used inside a butt-welded joint to reinforce the joint and to prevent weld metal from entering the pipe at the joint Word History First Known Use 1937, in the meaning defined above
随便看	bois de vache bois immortel bois immortels bois inconnu bois inconnus bois puant bois puants Boisbriand Boise Boisean boiserie boiseries boises boist boisterous boisterously boisterousness boisterousnesses boites Bojador, Cape Bojer Bok bok choi bok choy bokadam

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