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A famous health tip says you'd better drink eight glasses of water (about two liters) a day.
一条著名的健康小贴士建议，你最好每天喝八杯水（大约两升）。
However, the results of a new study suggest that less is needed.
然而，一项新研究的结果表明，（人们真正的）需水量更少。
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.
由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小组发现，20多岁的男性每日平均饮水量应为1.5至1.8升，而同龄女性每日平均饮水量应为1.3至1.4升。
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法对来自20多个国家的5604名参与者进行了调查，样本年龄覆盖8天大的婴儿到96岁的老人。
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岁的男性每天消耗4.2升水，而30至60岁的女性每天消耗3.3升水，随着年龄的增长，他们的需水量会下降。
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.
根据研究人员的说法，由于新陈代谢和体表水交换可提供15%的需水量，其余85%的需水量来自食物和饮水，食物和饮水各占一半，因此建议人们每天的饮水量不要超过总需水量的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映说：“大多数人可能不需要每天喝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.
根据这项研究，水周转率随着多种因素而变化，其中包括体型、身体活动、空气温度、湿度和海拔高度。
