它们在一个温度受到控制的单独房间里，以保存其中的旧纸。
They are in a separate room where the temperature is controlled, to preserve the old paper in them.
另一组生活在“贫困”的环境中，在光线昏暗、几乎没有刺激的房间里的单独的笼子里。
The other group lived in an "impoverished" environment in individual cages in a dimly lit room with little stimulation.
当把雌性牛鹂单独养在隔音的房间里，让它们听到雄性的歌声，它们就会表现出交配行为。
When female cowbirds raised in isolation in sound-proof chambers were exposed to recordings of male song, they responded by exhibiting mating behavior.
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