人体时刻都在产热和散热,如果环境过冷、散热太快就会觉得冷。保暖的本质就是减少导热和散热,而世界上导热率最低的物质是静止的空气。衣服穿得层数太多、太紧,就会挤压包裹的空气层,反倒影响保暖。羽绒服里正确搭配:内层穿排汗透气的纯棉衣物;中层穿柔软蓬松的毛绒制品,收紧领口、袖口和下摆。
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