以下为句子列表：
英文: A new Rand Institute study suggests obese Americans spent more for their health care than smokers do. Obesity adds almost $400 a year and smoking just 230.
中文: 兰德机构一项新的调查表明，在美国，肥胖者比吸烟者在保健方面花费更多，胖子每年几乎要花400美元而吸烟者仅花230美元。
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英文: A third of men will be officially obese in four years' time if current trends continue, the Government said.
中文: 政府指出，如果目前趋势不变，三分之一男子在四年内将正式列为过胖。
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英文: And if one adult sibling became obese, the chances that the other sibling would also become obese increased by 40 percent.
中文: 如果一成年兄弟变肥胖，那么另一个兄弟变肥胖的几率增加了40％。
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英文: As these once-obese humans lost weight over the course of a year, their mix of gut microbes changed to reflect their new, svelte status.
中文: 一年的疗程让过去肥胖的人瘦了下来，而且他们不仅拥有了一个苗条的身材同样得到了一个全新的肠道菌群。
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英文: BMI is calculated by dividing weight in kilograms by height in meters squared. A BMI between 20-25 in normal, 25-30 is pre-obese and more than 30 is obese.
中文: 体重指数（BMI）的计算方法是用体重（公斤）除以身高（米）再进行平方。体重指数在20-25之间为“正常”，在25-30之间为“肥胖前期”，大于30则为“肥胖”。
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