雪线

例句：

1. 1. The snow line is the point where the snow starts to melt.
   雪线是积雪开始融化的地方。
2. 2. The temperature has dropped below the snow line, making it difficult for us to go outside.
   温度已经降到了雪线以下，我们很难出去。
3. 3. The weather forecast predicts that the snow line will be reached by tomorrow afternoon.
   天气预报预测明天下午雪线将达到。