nivation cirque雪坑
nivation hollows雪蚀洼地
nivation niche雪蚀凹
Nivation Swale雪蚀洼地
nivation glacier新生冰川;[水文] [地理] 雪蚀冰川
nivation hollow[地理] 雪蚀凹地
nivation ridge雪蚀岭
nivation basin雪蚀洼地
nivation type glacier雪蚀冰川
N（名词） the weathering of rock around a patch of snow by alternate freezing and thawing 雪蚀