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汉语拼音：tiān zé

1.谓自然选择。认为在生物进化过程中适者生存﹑不适者灭亡的学说。

1. 谓自然选择。认为在生物进化过程中适者生存、不适者灭亡的学说。

   梁启超 《新民说·论合群》：“盖深知夫处此物竞天择界，欲以人治胜天行，舍此术未由也。” 鲁迅 《坟·人之历史》：“天然之力，亦择生物，与人择动植无大殊，所异者人择出人意，而天择则以生物争存之故，行于不知不觉间耳。”

• Over the millennia, the long coevolution of H. pylori and H. sapiens has put intense selective pressure on both species.

  幽门螺旋菌和现代智人几千年来的共同演化，对两个物种都带来激烈的天择压力。

• It matters little when a language becomes moribund and disappears. It's natural selection, applied to culture. The strongest wins.

  当一种语言奄奄一息且消失不是什麽大不了的事，这是一种天择，与文化有关，强者终究是最后的赢家。

• Because the risk is so much lower, Nunney argues, natural selection cannot drive the spread of new defenses against retinoblastoma.

  伦尼认为，因为风险非常低，天择无法驱使针对视网膜胚细胞瘤新预防措施散布到族群中。

• In contrast, two groups that are genetically similar to each other might be exposed to different selective forces.

  另一方面，两个遗传组成相似的人群，也许会暴露在不同的天择压力下。

• Population geneticists have also provided insight into natural selection by describing it mathematically.

  族群遗传学家也以数学的方式描述天择，并且提出看法。

• HAR1 is also the first documented example of an RNA-encoding sequence that appears to have undergone positive selection.

  此外，HAR1也是已知第一个可能受到正向天择的RNA编码序列。

• Recent research suggests that natural selection may have altered genes in ways that make cancer cells more dangerous.

  最近的研究指出，天择所改变的基因可能还让癌细胞变得更危险。

• silently and insensibly working, whenever and wherever opportunity offers.

  天择寂静无声、不知不觉地运作，不管何时何地都是机会。

• Natural selection keeps their clusters from blurring by favoring new mutants that are even better adapted to their niche.

  比较适应生态区位的突变受到天择青睐，而维持住群丛间的分野。