The key points are as follows: the igloo takes the shape of a circle with the smallest heat dissipation area, guides the strong wind with the round back with the smallest wind resistance, and sets a front room and an entrance for wind removal in the downwind, which has the highest wind resistance benefit. In addition, the ice cubes in the igloo are heat insulation materials filled with bubbles, and the gaps are filled with melted ice, forming an airtight shell.
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