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	gasses gassier gassiest gassily gassiness gassinesses gassing dawdlers dawdles dawdling dawdlingly dawdlingness dawdlings dawed Dawes Dawes' limit dawg dawgs dawing dawks dawn dawn (on) dawn blue dawn chorus dawn choruses

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