There're two reasons for this: first, they live in the active layer, which, remember, contains water that doesn't penetrate the permafrost.
造成这种情况的原因有两个：首先，它们生活在活动层中，请记住，活动层中包含的水不会渗透永久冻土。
Beneath this active layer is a second layer called "permafrost", which is frozen all year around, and is impermeable to water.
在这一活跃层下面，是被称为“多年冻土”的第二层，终年冻结，不透水。
Fascinating for both the novice and advanced aquarist, these brightly colored fish are active, yet peaceful inhabitants of the upper water layer of the aquarium.
水族爱好者中不论是新手还是老手都为这种鱼着迷，这些体色明艳的鱼只活泼而平和，生活在鱼缸的上层水区。
Fascinating for both the novice and advanced aquarist, these brightly colored fish are active, yet peaceful inhabitants of the upper water layer of the aquarium.
水族爱好者中不论是新手还是老手都为这种鱼着迷，这些体色明艳的鱼只活泼而平和，生活在鱼缸的上层水区。
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