Contagious yawning is thought to be an evolved mechanism for keeping groups alert so they "remain vigilant against danger," Gallup said.

呵欠传染被认为是进化出来用于保持群体的警惕性使群体“在危险面前保持警觉，”盖洛普说。

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Like animals, humans evolved with an elaborate mechanism for processing information about potential threats.

和动物一样，人类进化出了一套复杂的机制，来处理有关潜在威胁的信息。

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Because the oil is used as a reserve nutrient—like fat—diatoms have evolved no mechanism to secrete it.

由于油的作用是营养储备——就象脂肪似的——所以硅藻没有进化出分泌油份的机制。

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It's a mechanism that they have evolved in order to prevent foreign genes from entering a cell and being expressed.

它们进化出这种机制来,防止异源基因进入细胞并表达

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As a result, certain plants in warm climates have evolved a different mechanism, called C4 photosynthesis, in which other enzymes help to concentrate CO2 around the rubisco, and the initial result is a four-carbon sugar.

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This mechanism apparently evolved to help the body preserve a vital source of energy.

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One theory is that sensitivity to bitter flavor could have evolved as a protective mechanism against poisonous plants.

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