它们引起了细胞内的生物化学变化，并最终改变了大脑回路中对愉快的经历和记忆的反应方式。

They trigger intracellular biochemical events that eventually modify brain circuits that mediate the experience and memory of pleasure.

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这种基因往往会抑制他们大脑的恐惧回路，加剧大脑对赚钱前景的反应。

That tends to damp their brains' fear circuitry and to intensify their brains' reaction to the prospect of making money.

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在这起事故中，低劣的控制室指示器指引电站工作职员封闭了为反应堆芯堆降温的回路。

In that case, poor control room indicators led plant officials to switch off the circuit which would have cooled the reactor core.

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