派迪恩说：“它们的基础新陈代谢率一定很高才能长那么快。”
Says Padian: "They must have had a high basal metabolic rate to grow that fast."
这对于地外生命学来说意义重大。因为生命建立在碳的基础上，而由碳和氢构成的甲烷是新陈代谢的副产品。
That has big implications for extraterrestrial biology, since life is based on carbon, and methane - which is made up of carbon and hydrogen - is a byproduct of metabolism.
但黑熊的新陈代谢率却甚至直降到了储能区以下，平均仅为夏天基础代谢率的25%。
But the bears' metabolisms plunged down to even more energy-saving zones, averaging only 25 percent of the basic summer rate.
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