进化使得某些体质上的能力形成一种折衷的状态。
There is an evolutionary trade-off for certain physical abilities.
跑步的老鼠会有体质上的优势，像是更好的耐力和更少的脂肪。
The running mice do have physical advantages like better endurance and less body fat.
该研究的分析报告发表在《美国体质人类学杂志》上。
That analysis appears in the American Journal of Physical Anthropology.
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