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	chré Chrétien Chrétien de Troyes cht chthonian chthonianer chthonianest chthonianner chthoniannest chthonic chthoniccer chthoniccest chthonicer chthonicest chtr chu Chu Chu Hsi chu mustache Chu Teh chu-chou Chuana chuanchow Chuang chuangs

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