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https://www.psu.edu/news/research/story/humans-cant-endure-temperatures-and-humidities-high-previously-thought/
新研究发现 31°C wet-bulb 就够要你命了(以前认为是35°C)。找了个 Wet Bulb Calculator 算了算，相当于60%湿度下的37°C，或者80%湿度下的34°C，不就，日常……
