snow line
snow-line的词性:
n.(名词)
1. The lower altitudinal boundary of a snow-covered area, especially of one that is perennially covered, such as the snowcap of a mountain.
雪线:冰雪覆盖地的较低高度分界线,特别是长年积雪地区,如覆有积雪的山顶
2. The fluctuating latitudinal boundaries around the polar regions marking the extent of snow cover.
万年雪线:在两极地区标志着雪盖波动范围的纬度边界