如何在夏天保持凉爽
<p><span word="Summer">Summer</span> <span word="is">is</span> <span word="coming">coming</span>. <span word="When">When</span> <span word="those">those</span> <span word="days">days</span> <span word="come">come</span>, <span word="every">every</span> <span word="second">second</span> <span word="you">you</span> <span word="spend">spend</span> <span word="outside">outside</span> <span word="feels">feels</span> <span word="like">like</span> <span word="a">a</span> <span word="dehydrating">dehydrating</span> <span word="walk">walk</span> <span word="through">through</span> <span word="the">the</span> <span word="sauna">sauna</span>. <span word="But">But</span> <span word="don">don</span>’<span word="t">t</span> <span word="sweat">sweat</span>. <span word="There">There</span> <span word="are">are</span> <span word="ways">ways</span> <span word="to">to</span> <span word="cool">cool</span> <span word="your">your</span> <span word="body">body</span> <span word="down">down</span> <span word="without">without</span> <span word="resorting">resorting</span> <span word="to">to</span> <span word="a">a</span> <span word="portable">portable</span> <span word="AC">AC</span> <span word="unit">unit</span>.</p><p>酷夏即将来临。当最热的时候到来时，在室外的每一秒都像是桑拿屋里的脱水之旅。但是别紧张，总有让你不用便携空调也能保持身体凉爽的方法。</p><p><span word="Scientists">Scientists</span> <span word="first">first</span> <span word="started">started</span> <span word="studying">studying</span> <span word="how">how</span> <span word="weather">weather</span> <span word="contributes">contributes</span> <span word="to">to</span> <span word="human">human</span> <span word="comfort">comfort</span> <span word="in">in</span> <span word="the">the</span> 1960<span word="s">s</span>. <span word="That">That</span>’<span word="s">s</span> <span word="around">around</span> <span word="the">the</span> <span word="time">time</span> <span word="when">when</span> <span word="the">the</span> <span word="invention">invention</span> <span word="of">of</span> <span word="air">air</span> <span word="conditioning">conditioning</span> <span word="finally">finally</span> <span word="let">let</span> <span word="us">us</span> <span word="control">control</span> <span word="the">the</span> <span word="temperatures">temperatures</span> <span word="of">of</span> <span word="office">office</span> <span word="buildings">buildings</span> <span word="and">and</span> <span word="homes">homes</span>. <span word="A">A</span> <span word="scientist">scientist</span> <span word="named">named</span> <span word="Povl">Povl</span> <span word="Ole">Ole</span> <span word="Fanger">Fanger</span> <span word="came">came</span> <span word="up">up</span> <span word="with">with</span> <span word="an">an</span> <span word="equation">equation</span> <span word="called">called</span> <span word="the">the</span> <span word="comfort">comfort</span> <span word="equation">equation</span>, <span word="which">which</span> <span word="took">took</span> <span word="into">into</span> <span word="account">account</span> <span word="a">a</span> <span word="variety">variety</span> <span word="of">of</span> <span word="different">different</span> <span word="variables">variables</span>, <span word="including">including</span> <span word="temperature">temperature</span>, <span word="humidity">humidity</span>, <span word="air">air</span> <span word="velocity">velocity</span>, <span word="clothing">clothing</span> <span word="resistance">resistance</span>, <span word="and">and</span> <span word="activity">activity</span> <span word="level">level</span>. <span word="His">His</span> <span word="equation">equation</span> <span word="has">has</span> <span word="also">also</span> <span word="helped">helped</span> <span word="us">us</span> <span word="better">better</span> <span word="understand">understand</span> <span word="how">how</span> <span word="the">the</span> <span word="human">human</span> <span word="body">body</span> <span word="cools">cools</span> <span word="itself">itself</span>—<span word="and">and</span> <span word="how">how</span> <span word="to">to</span> <span word="stay">stay</span> <span word="chill">chill</span> <span word="even">even</span> <span word="on">on</span> <span word="the">the</span> <span word="hottest">hottest</span> <span word="of">of</span> <span word="days">days</span>.</p><p>科学家第一次研究天气对人体舒适度的影响是在20世纪60年代。差不多在同时期，空调的发明让我们可以随意调节办公楼和家里的温度。一位名叫伯维尔·欧乐·范格的科学家提出了一个舒适度方程，方程要考虑的变量包括温度、湿度、气流速度、穿着和活动量。他的这个方程帮我们更好地了解人体自我降温的原理，以及如何在最热的天气里保持凉爽的。</p>
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