With the scarcity of metal toward the end of World War II, Project Habbakuk was an attempt to create aircraft carriers out of pykrete, a mixture of ice and wood pulp.

由于在二战末期金属缺乏，哈巴库克项目做了个尝试，用冰和木浆的混合物制造航空母舰。

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After the Civil War (1861-1865), as ice was used to refrigerate freight cars, it also came into household use.

内战(1861- 1865)之后，冰被用于冷藏货车，同时也进入了民用。

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After the Civil War (1861-1865), as ice was used to refrigerate freight cars, it also came into household use.

内战(1861- 1865)之后，冰被用于冷藏货车，同时也进入了民用。

youdao