1550s, "one who keeps a rule, custom, etc.," agent noun from observe. Meaning "one who watches and takes notice" is from 1580s; this is the sense of the word in many newspaper names.
权威例句
1. The current sole superpower is far from being a disinterested observer.
当前唯一的超级大国远不是一个公正的旁观者。
2. There is a lengthy article on Spike Milligan in the Observer newspaper.
《观察家报》上有一篇关于斯派克·米利根的长篇文章。
3. The Observer found the play "a feeble rehash of familiar Miller themes"
《观察家报》认为这部剧“是大家熟悉的米勒式主题的拙劣翻版”。
4. As an impartial observer my analysis is supposed to be objective.
作为中立的观察员,我的分析应该客观。
5. The talks took place in the presence of a diplomatic observer.