Modern life makes us tired, right? But research from societies in Africa and South America suggests people in the ancient ...

Modern life makes us tired, right? But research from societies in Africa and South America suggests people in the ancient ...

温度越低，冻伤的风险越高。一般气温低于0°C时就有冻伤风险，但当风寒指数降至-27°C时风险会显著增加。暴露皮肤通常需要约30分钟就可能发生冻伤，血液流向离心脏较远的区域（如手、脚、鼻子和耳朵）会严重受限。