Like the life span, the metabolic rate has for different organisms a fixed mathematical relationship to the body mass.

就像寿命一样，不同生物的新陈代谢率与身体质量有着固定的数学关系。

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Roughly 250 million years ago, in the worst series of mass extinction in Earth's history, almost all species of life simply vanished.

大约2.5亿年前，在地球历史上最严重的一系列大灭绝中，几乎所有的生命物种都消失了。

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As Permian life-forms declined, they reached a fatal threshold and species succumbed to mass extinction.

随着二叠纪生命形式的衰退，它们达到了一个致命的临界点，物种最终走向了大灭绝。

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Mr. White bought a Mass Mutual Life Insurance policy through his employer in 1992.

FORBES: Unfair Tax Court Decisions On Life Insurance Are Tip Of Unclaimed Property Iceberg

Mass extinction of life on Earth.

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Couple such capability with new satellite measurements (America's Orbiting Carbon Observatory 2 is due to launch in a few years) and better measurements of the mass of plant life in forests and other ecosystems, and the planet's greenhouse-gas credits and debits will surely be understood far better.

ECONOMIST: Greenhouse-gas monitoring