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	shufties shug Shugni shugnis shuhaer shuhaest Shukria shukrias shul Shull shuls Shultz shumac shumacs Shumagin Shumard oak shumard red oak shummick shun Shunammite shune shunless shunned shunner shunners

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