名词
中文翻译：观察者
同义词：
['spectator', 'observer']
例句：
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1. The scientist observed the experiment carefully.
科学家仔细观察了实验。
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2. The spectators cheered as the athlete finished his run.
观众们在运动员跑完时欢呼起来。
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3. The observers noted that the temperature had dropped significantly.
观察者注意到温度显著下降。