One way the study of epigenetics is revolutionizing our understanding of biology is by revealing a mechanism by which the environment directly impacts on genes.

研究表观遗传学的一个方法是通过揭示环境直接影响基因的机制来彻底改变我们对生物学的理解。

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Low levels of straying are crucial, since the process provides a source of novel genes and a mechanism by which a location can be repopulated should the fish there disappear.

低水平的游离是至关重要的，因为这个过程提供了一种新基因的来源和一种机制，通过这种机制，如果该地鱼群消失，可以重新繁殖该种群。

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The emetic mechanism by the digitoxin is discussed.

讨论了洋地黄毒物的催吐原理。

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"By suddenly having an actual mechanism to value these systems in dollars, it gives you a potentially very large new mechanism for countering the other financial and economic arguments."

VOA: special.2011.05.10

Take a step way back and think about what's the basic mechanism by which cells receive signals.

现在让我们回过头来思考,细胞接收信号的基本原理

耶鲁公开课 - 生物医学工程探索课程节选

We're cloning a gene of interest to us by sort of hijacking that biological mechanism by putting our gene on this plasmid and so our gene gets copied many times, as the plasmid gets copied many times.

我们克隆感兴趣的基因的做法,这个生物机制有点像是绑架,我们把基因绑在质粒身上,随着质粒被多次地复制,我们的基因也一起被多次复制

耶鲁公开课 - 生物医学工程探索课程节选

The mechanism by which this fraud was carried out was called Repo 105 .

FORBES: Repo 105 Charge Offers a Touch of Closure

Hamid will head the socio-political unit, the mechanism by which the military ensures national stability.

CNN: INDONESIA

For others it should be a mechanism by which the state seeks to promote individual morals.

BBC: Is the welfare state about need or nudging?