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observed + noun
后接名词，表示观察或注意到某事物。
The scientist observed the phenomenon.
科学家观察了这个现象。
被观测到的；被注意到的
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被观测到的；被注意到的
perceived or noticed by observation
The scientist observed the phenomenon.
科学家观察了这个现象。
常作定语
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在非通常日期特别庆祝的
Exceptionally celebrated on a date other than the usual date.
The scientist observed the behavior of the ants for several hours.
科学家观察蚂蚁的行为长达数小时。
The changes were observed by the research team.
这些变化被研究团队观察到。
She observed that the temperature had dropped significantly.
她注意到温度显著下降了。
后接名词，表示观察或注意到某事物。
The scientist observed the phenomenon.
科学家观察了这个现象。
常用于陈述观察到的事实。
She observed that the door was open.
她注意到门是开着的。
表示目睹某人正在做某事。
We observed him leaving the building.
我们看到他离开大楼。
Not this
He observed to the problem.
Use this
He observed the problem.
Observed 是及物动词，直接跟宾语，不需要介词 'to'。
Not this
She was observed the accident.
Use this
She observed the accident.
Observed 作为过去式时主动语态不需要 'was'；'was observed' 是被动语态，但此处应为主动。
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