observern.
英 əb'zɜːvə | 美 əb'zɝvɚ
中文n. 观察者；[天] 观测者；遵守者
词根词源
observer (n.)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.
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