perennially frozen lake

例句：

1. 1. The lakeis so deep that it's hard to imagine anything living in it.
   这个湖太深了，很难想象有什么生物能在里面生存。
2. 2. The perennially frozen lake was a popular destination for winter sports enthusiasts.
   这个永久冰冻的湖是冬季运动爱好者的热门目的地。
3. 3. The lake was so cold that the ice formed quickly and remained solid for years.
   这个湖非常冷，冰很快就形成了并保持了多年的固态。