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(chēng)為五十年來(lái)最嚴重的一次。
詞匯搭配
- iced firn 凍結粒雪
- firn snow 陳雪,粒雪
- firn limit 雪線(xiàn)
- ice firn 凍粒雪
- firn line 永久雪線(xiàn),粒雪線(xiàn)...
- firn basin 粒雪盆地
- firn field 永久積雪原
