清晨，知更，猫鸟，野鸽，松鸦，鹪鹩，还有各种其它鸟声曾经在黎明时分形成大合唱，出现一派勃勃生机的清晨，现在已是毫无声息了。
On the mornings that had once throbbed with the dawn chorus of Robins catbirds doves jays wrens and scores of other bird voices there was now no sound.
科学家把“黎明大合唱”给记录下来，并使用声音回放实验，来看看他们是否能引发出一个森林范围内的“猴吼”，来更深入地了解它们加入大合唱的原因。
The scientists recorded the dawn chorus and used playback experiments to see if they could trigger one of a forest-wide calls to find out more about why the animals joined in.
这项实验的目的是观察喂养对雄性大山雀在黎明时的合唱表现的影响。
Dr Amrhein expected that males who were being given extra food would perform better during the dawn chorus than those that were not.
这项实验的目的是观察喂养对雄性大山雀在黎明时的合唱表现的影响。
Dr Amrhein expected that males who were being given extra food would perform better during the dawn chorus than those that were not.
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