This is the 12136th most frequent Korean word.
눈은
"눈은" means "as for the eyes" or "eyes (topic marker)" in Korean.
In this sentence, '눈은' functions as the subject of the sentence, referring to 'snow' and marking it with the topic particle '은'.
눈은 아름다운 자연 현상이다.
Snow is a beautiful natural phenomenon.
Here, '눈은' highlights 'snow' as the topic of the sentence, pointing out its significant presence during winter.
겨울에는 눈은 많이 내린다.
During winter, snow falls heavily.
In this usage, '눈은' again acts as the topic, with emphasis on snow's effect on humans.