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2024考研英语同源外刊12月:每天8杯水究竟科学吗？

We may not need to have eight glasses of water a day, says study
研究表明，我们可能不需要每天喝八杯水

A famous health tip says you'd better drink eight glasses of water (about two liters) a day. However, the results of a new study suggest that less is needed.
网上经常流传着一种说法，每天喝8杯水（大约两升）有益于身体健康。然而，一项新的研究结果表明，每天8杯水的建议可能超过了我们的实际所需。

An international group led by scientists at the Shenzhen Institute of Advanced Technology (SIAT) in China found that the average daily water intake of a man in his twenties should be 1.5 to 1.8 liters, while it should be 1.3 to 1.4 liters for a female in the same age group.
中国科学院深圳先进技术研究院的科学家领导的一个国际科研团队发现，20多岁的男性平均每日饮水量应该在1.5至1.8升之间，而20多岁的女性则应在1.3至1.4升之间。

The researchers investigated 5,604 participants from the ages of 8 days to 96 years and from more than 20 countries, using isotope-tracking methods.
研究人员使用同位素追踪方法调查了来自20多个国家的5604名参与者，参与者的年龄从8天大到96岁不等。

They have found that a man aged 20 to 35 consumes 4.2 liters of water each day, while a woman aged 30 to 60 consumes 3.3 liters, with the water requirements dropping as he or she ages.
他们发现，20至35岁男性每天的水周转量为4.2升，30至60岁女性每天的水周转量为3.3升，而且随着年龄的增长，机体对水的需求量会下降。

Since the metabolism and water exchange on skin can provide 15 percent, while food and drinking contribute half each of the remaining 85 percent, people are thus suggested to drink less than 45 percent of the total daily turnover, according to the researchers.
研究人员称，由于新陈代谢和体表水交换可以提供15%的水分，而食物和饮水各占剩下85%的一半，因此建议人们每天摄入的水分少于总周转量的45%。

"The majority of people perhaps don't have to drink 8 glasses of water a day," said Zhang Xueying, co-first author of the paper and an assistant research fellow at the SIAT.
该论文的共同第一作者、中国科学院深圳先进技术研究院助理研究员张雪英说：“大多数人可能不需要一天喝8杯水。”

The total water input and output varies according to multiple factors, including body size, physical activity, air temperature, humidity, and altitude, according to the study.
研究表明，总的水周转量受多种因素的影响，包括体型、身体活动量、温度、湿度和海拔高度。

重难点词汇：
isotope [ˈaɪsəˌtoʊp] n. 同位素
metabolism [məˈtæbəlɪzəm] n. 新陈代谢

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