n. 
土石
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obtund,
obtundent,
obturate,
obturation,
obturator,
obtuse,
obtuse angle,
obtuse angle,
obtuse triangle,
obtusely,
相似单词
tonsilsector,
tonsolith,
tonsonite,
tonsorial,
tonsorialist,
tonstein,
tonsure,
tonsured,
tontine,
tontise,