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	khwarezmian khwarizmian khwā Khwārizmī, al- Khyber Pass kHz khzes khíos Khālid ki ki disease ki national monument ki-yi ki-yied ki-yiing ki-yis KIA kia ora kiaat kiaats kiabooca kiabooka kiaki kiamusze kiang

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