短语词组短语observing tube 观察管observing ine 视准线Observing directly 直接计数observing station [天]观测站;[天]观测台;观测站observing ability 观察能力;观察力Observing room 留观室observing frequency 观测频率observing pattern 观察型样;翻译observe on 评论 返回 observing