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.
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。
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