当食物稀缺并需要动物消耗体力去捕食时，增加对非偏好品的渴望能帮助动物吃下他们所获得的食物，即使尝着味道真的不怎么样。
When food is scarce and animals exert energy to retrieve food, increasing the desirability of less tasty food would help animals eat what they had caught, regardless of its inherent tastiness.
此前的研究显示，他们的日常能量消耗与大多数美国人差不多，这表明体力活动并非他们身体相对健康的原因。
Previous research shows that their daily energy expenditure is about the same as most Americans, suggesting physical activity is not the reason for their relative good health.
即由于体力消耗，在他们的血液内产生了多少乳酸，及这些乳酸对健康的影响。
It indicates how much lactic acid has collected in their blood as a result of physical exertion and enables conclusions to be drawn about their fitness.
去营地的路消耗他们的体力，很多人因此而死去。
去营地的路消耗他们的体力，很多人因此而死去。
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