The genetic switch involves acetylation, the introduction of an acetyl group into a molecule at the DNA level of chromatin resulting in genetic transcription.

基因“开关”涉及乙酰化作用，也就是将乙酰基群在染色质的DNA水平上引入到分子中，由此完成基因转录。

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After the introduction of the bacteria extract injected into the muscles this was extended by an average 308 days, whereas the control group continued to die about a year earlier.

在引进的细菌提取物注射到老鼠的肌肉中之后，它们的寿命平均延长了308天，而控制组的老鼠大约一年前就死去了。

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Fortunately, the introduction and now popularity of XPath (and XQuery, mentioned late in this article) have introduced a new group.

幸运的是，XPath(和XQuery，本文稍后将会谈到)的引入和流行带来了一个新分组。

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The goal was to see how this population would react to the introduction of abuse-resistant OxyContin after establishing a baseline of abuse with the same group for the original version.

FORBES: Is The Era Of OxyContin Abuse Over?

Right at the beginning of this event there was an introduction by a group called Champion the Vote.

BBC: South Carolina: Up close and in personhood

The introduction of a new Qantas Group structure with dedicated CEOs for Qantas International and Qantas Domestic will bring further rigor to our business.

CNN: Qantas predicts huge profit slump