The difference between the Eskimo igloo and the Indian tepee was insulation : the igloo 's walls were solid and airtight whereas those of the tepee permitted a great deal of air to enter .

爱斯基摩的冰屋与印地安人的 帐棚之间 最大 的 差别在于绝缘，冰屋的墙壁是坚硬而密闭，然而帐棚的墙壁会让许多空气钻进来。