C2 a person who watches what happens but has no active part in it观察者,观察家
More examples
Throughout the novel, the story is seen through the eyes of a detached observer.
To a casual observer, everything might appear normal.
"It was a parody of a trial, " said one observer.
Few observers believe that the treaty will bring a lasting peace to the region.
UN observers were there to ensure the smooth transference of power.
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