单词	ringback
释义	ringbackring‧back /ˈrɪŋbæk/ noun [uncountable] a telephone service that you can use when you call someone who is already using their telephone. The service arranges for their telephone to ring yours as soon as their line is free.
随便看	off the record off-the-shelf off-the-wall offtrack off-white off-year Ofgem Of Mice and Men Ofsted oft Oftel often oftentimes Ofwat ogle OGM O grade ogre OH oh O'Hara, Scarlett O'Hare Ohio ohm oho

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