observobservation 观察；观测；观察资料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)observabilitycondition可观测性条件OBS Out of Band Signal带外信号obsolescence allowance折旧observability analysis可观测性分析Obstetric complication产科并发症obstetrical department产科obsolescence principle老化规律observing and recording观察与记录observing Rn instrument测氡仪observing one's conduct