When the egg is fertilized, the substances become active and, presumably, govern the behavior of the genes they interact with.

当卵子受精时，这些物质变得活跃起来，并可能控制与它们相互作用的基因的行为。

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Previously it was primarily airport hotels and other facilities offered in the surrounding area of the airport that had the potential to take on this role and become active as a business space.

以前，主要是机场周边地区的机场酒店和其他设施有潜力承担这一角色，成为活跃的商业空间。

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Become active in a professional association.

积极参与专业协会。

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Each one works with 2,000 people. The field officers go from house-to-house, person-to person to get each individual to become active in the fight against HIV/AIDS.

VOA: standard.2010.07.01

So every time you move your arm, that area of the brain with green line starts, become active in a particular way.

因此，每当你运动手臂的时候，大脑中绿线的部分开始工作，以特定的方式活跃起来。

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There are more steps that have to happen correctly in order for that insulin to become active.

还有几个步骤,必须正确完成这些步骤后,才能生成有活性的胰岛素

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Founders and investors must become active in shaping policies that will protect and support emerging technologies.

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Collier had become active with the MIT Outing Club, joining students skiing and hiking.

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"They are interested, and one day they may become active, " says Ellen Gordon, 68.

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