这次搜罗从24个不同的群落中找出了八个物种2万余只动物的信息。这些物种包括猫、狗、小鼠、大鼠和几种猴。有些是在严格控制的研究环境下饲养的。其它的生活在人的家中或在野外生存。它们的食物摄入量均未人为限制或是象喂牲畜一样加料。
For each population, Dr Klimentidis looked at the animals weight at an age corresponding to35 human years. Middle adulthood was chosen to ensure the data were not fudged by theeffects of either early development or old-age withering. Any animals that died within a yearof this mid-life physical were also excluded.
对于每个群落,克利曼泰迪斯博士都调查了年纪相当于人类35岁的动物的体重。选择成年中期是为了确保数据既不受早期发育的影响也不受老年萎缩的影响而掺假。任何在这个中期体检年内死亡的动物也被排除。
He then proceeded to calculate each population s average weight, as well as its obesityrate, for every decade of available data. The obesity rates were based on a bespokeindicator akin to the body-mass index that is used to gauge whether a person istoo rotund. This ploy permitted comparison between species in which weights havedifferent meanings.
接着,他计算出每个群落的平均体重以及肥胖率,每十年取一个可用的数据。肥胖率的计算按预定的指标为基础上进行,预定指标类似于用来衡量一个人是否太圆的身体-质量指数。这项工作允许在体重意义不同的物种之间进行比较。
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