OBSabbr.观察(=Observation）abbr.瞭望台（=Observatory）abbr.已废的(=Obsolete)abbr.无线电定向标选择器(=Omnibearing Selector)observablyadv.显著地；醒目地obsturatorn.充填体obsidionaladj.包围的；围攻的Obscuranton.晦涩难懂的语言obsoletismn.废弃(被废弃了的东西)obscission脱落现象obstrutive阻塞性obsignatory批准,认可obstipantia止泻剂obsidionaryadj.包围的；围攻的