In Alaska, retreating glaciers, receding summer ice levels and thawing permafrost will cause damage to infrastructure and ecosystems.

在阿拉斯加，冰川消退、夏季冰层消退和永久冻土层融化将对基础设施和生态系统造成破坏。

These two processes of making and melting ice kept the ice level in balance - having different parts or elements arranged in the correct proportions.

冰形成和冰融化的这两个过程使冰量保持平衡——不同部分或不同元素按恰当的比例排列。