万年雪线

例句：

1. 1. The glaciers on the mountain are like a million-year-old snow line.
   山上的冰川就像百万年的雪线。
2. 2. The glaciers on the mountain are like a million-year-old snow line.
   山上的冰川就像百万年的雪线。
3. 3. The glaciers on the mountain are like a million-year-old snow line.
   山上的冰川就像百万年的雪线。