实用贴：如何在夏天保持凉爽

　　穿着中袖和长裙的初夏是一年中最惬意的时节，天气开始变热但又不会烤得人难受，还可以打扮得美美哒。可惜好景不长，很快天气就会变得异常炎热，到那时就算穿短袖和热裤还是有蒸桑拿的感觉。如何才能优雅地度过漫漫苦夏?本文为你来支招。

　　Summer is coming. When those days come, every second you spend outside feels like a dehydrating walk through the sauna. But don’t sweat. There are ways to cool your body down without resorting to a portable AC unit.

　　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。

　　Scientists first started studying how weather contributes to human comfort in the 1960s. That’s around the time when the invention of air conditioning finally let us control the temperatures of office buildings and homes. A scientist named Povl Ole Fanger came up with an equation called the comfort equation, which took into account a variety of different variables, including temperature, humidity, air velocity, clothing resistance, and activity level. His equation has also helped us better understand how the human body cools itself—and how to stay chill even on the hottest of days.

　　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。

　　以下就是这个舒适度方程中的要点：

　　Wear loose clothing, mostly cotton

　　穿棉质宽松的衣服

　　This seems obvious, but wearing clothing that is loose rather than tight allows air to flow past the skin. This carries away the warmth that your body generates and allows cooler air to flow back in. Clothes like tight jeans or a snug jacket trap that heat against your skin, which just makes you feel hotter. On the other hand, less fitted clothes like loose pants, a flowy shirt, or a dress all allow air to keep circulating.

　　这一条似乎显而易见，比起穿紧身的衣服，宽松的衣服可以使空气在皮肤上流动。这样(宽松的衣服)可以带走你身体产生的热量，也可以让凉爽的空气流入进来。紧身牛仔裤和紧身夹克之类的衣服会把热气禁锢在你皮肤上，会让你觉得更热。另外，像是宽松的裤子、飘逸的衬衫或裙子等等不那么紧身的衣物可以保持空气的流通。

　　The type of fabric you wear has an influence, too. When it’s really hot out, materials that “breathe”—allowing the flow of air through the fabric itself—also work to keep you cool. Cotton and linen are among the most breathable fabrics, so look for clothes made of those substances, as opposed to less permeable synthetics.

　　衣物的面料也是有影响的。室外十分炎热的时候，可以“呼吸”的面料也能让你感到更凉爽，因为空气可以穿过面料本身。棉和亚麻是最透气的面料，所以多穿这些面料的衣物，少穿透气性差的人造纤维面料。

　　Apply cold packs strategically

　　巧用冷敷袋

　　Your body regulates its temperature via a small peanut-shaped section of the brain known as the hypothalamus. This region works almost like a thermostat in a home, turning the temperature up or down based on various factors—such as how cold or hot the skin is.

　　人的身体通过脑部花生大小的下丘脑来调节体温。下丘脑的工作原理和家中的恒温器相似，根据不同的因素来调高或降低体温，比如说，根据皮肤温度的冷热。