the bays that have been frozen up all winter,这些海湾已封冻了一整个冬天
froze up:冻结
The cooking utensil were frozen up in the ice.
炊具都给冻在冰里了。
The water pipe froze up.
这水管冻结了。
but are now opening up.而现在刚开始解冻
open up:打开, 开发, 展现, 开始, 揭露, 开放
After a few drinks he began to open up a bit.
他喝了几杯酒话就多起来了。
The book will open up to readers new vistas on economic thinking.
这本书将为读者展现经济思想的新远景。
cutting off the air that they need to breathe.隔绝它们所需的空气
cut off:切断, 使隔绝
He was cut off from his fellows.
他和同伴失去联系。
The heavy wind cut off the wire.
大风刮断了电线。