firn的用法和樣例：
例句
用作名詞 (n.)
- Snow has lasted for several days in many districts and the firn is considered as the most serious one during the last 50 years.
在許多地區，大雪已連續下了很多天，積雪被稱為五十年來最嚴重的一次。
辭彙搭配
- iced firn 凍結粒雪
- firn snow 陳雪,粒雪
- firn limit 雪線
- ice firn 凍粒雪
- firn line 永久雪線,粒雪線...
- firn basin 粒雪盆地
- firn field 永久積雪原
