Most now agree that there is no single cause for bipolar disorder-rather, many factors act together to produce the illness.

大多数现在都认为，有没比较单一的原因为躁郁症，许多因素共同行动，产生疾病。

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Transcription factors act a little bit like the 'Settings' of our cells, just like the Settings on our phones or computers.

转录因子的活动方式与细胞的‘设置’有点相似，联想一下手机或电脑的‘设置’就明白了。

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We want to find out the factors which affect the behavior of the users of the SNS virtual communities and how the factors act.

本研究的目的就是探索社交类虚拟社区成员行为的影响因素和影响机制。

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Low-mercury and mercury-free methods are available, but socio-economic factors often act as barriers to miners adopting these alternative ways to extract gold, the authors add.

BBC: UN: Rising mercury emissions increase risk to humans

Regarding Napster's claim that its users were not infringing copyright because sharing copyrighted musical compositions and sound recordings via the Napster service is protected by the "fair use" doctrine, the court held that the four fair use factors in the Copyright Act tip the balance in the record companies' favour.

BBC: Napster ruling: The legal issues

And some proteins act as transcription factors, regulating the output of the genes themselves.

ECONOMIST: Genomics has not yet delivered the drugs, but it will