abbr. United States Information Agency 
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norbornane, norborneol, norbuxamine, NORC, norcholane, NORCO, norcoleucine, nord, nordefrin, nordenskioldine,
相似单词
usher, usher in, usherette, ushers, ushership, USIA, USIB, using, USIS, USITC,