临时演员扮演在人群中、街道上或室内背景场景的人，他们可以来自各行各业。
Extras, who play the people in crowds, on streets, or in the background of indoors scenes, can come from all walks of life.
有时，那是因为在新的人群中，人们其他的基因作用下的遗传背景掩盖了基因A对抑郁的效应。
Sometimes it is because in the new population, the genetic background for their other genes masks the effect of gene a on depression.
由研究中引用的背景资料可知，超过52%的2型糖尿病患者比非2型糖尿病的人群更容易情绪低落。
People with type 2 diabetes are 52% more likely to become depressed than people without the condition, according to background information cited in the study.
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