动物体型越大，其体表体积比越低；躯体每增加一盎司的重量，所能散发热量的表面就成比例减少。
The bigger the animal is, the lower its surface-to-volume ratio; for every ounce of body mass, there is proportionately less surface through which heat can escape.
生态学家目前已经发现栖息地面积缩小的另一种影响，在那些栖息地面积缩小的同时，生活在那里的动物体积也随着缩小。
Ecologists have now discovered another effect. It would appear that, as the habitat shrinks, so too do the creatures that live there.
动物体积越大，它们的体重每克消耗的能量比体积小的要少得多，即使在休息的时候也是如此。
Larger animals tend to use less energy per gram of body mass than smaller ones do, even at rest.
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