它们常常在小行星上被发现，在那里，它们通过深入岩石的复杂根系分解矿石产生代谢变化。

They are most often found on asteroids, where they metabolize minerals through an intricate root system that taps into the rock.

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几天之后，测验封闭在里面的空气是否有放射性。如果有的话，说明营养物质多少已经产生代谢变化。

After several days, the enclosed atmosphere was tested for radioactivity, which might indicate that the nutrients had somehow been metabolized.

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你知道，亚贡雪莲果的菊糖是直接通过消化区域而不用产生代谢变化的，这适合那些缺乏必需的酶代谢的胰岛素的人食用。

You see, the human body lacks the enzyme necessary to metabolize insulin, so the substance that gives yacon its sweetness passes through the digestive tract unmetabolized.

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Now these changes, these human evolutionary changes, have created some very interesting metabolic things inside our bodies.

而今,这些改变,这些人类演化造成的变化,在人体内产生了一些很有意思的代谢过程

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选