All over the world, temperatures are going up at night due to global warming. A study found that when the temperature at night is over 30°C, the length of nightly sleep decreases by over 14 minutes. This may not seem like a lot at first, but a study reveals that a global average of 44 hours of sleep are lost for each person per year. When people lack sleep, their immune systems become weak. They get sick and forgetful, and there is even a higher risk of major diseases like cancer.
由于全球暖化，世界各地的夜间气温都在上升。一项研究发现，当夜间温度超过摄氏三十度时，夜间睡眠时间会减少超过十四分钟。起初这可能感觉不多，但一项研究指出全球平均每年每人失去四十四小时的睡眠时间。当人们缺乏睡眠时，他们的免疫系统就会变弱。他们会生病、变得健忘，甚至有更高的风险罹患癌症等重大疾病。
生活必备字词：
global warming 全球暖化
decrease vi. 减少
risk n. 风险
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本文节录自《常春藤生活英语》杂志，完整内容请见一月号。
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