英文: VOCAL AND VOCAL CENTERS IN BIRDS
中文: 鸟类的发声与发声中枢英文: AVIAN VOCAL ORGAN AND VOCAL CONTROL MECHANISM
中文: 鸟类的发声器官及其调控机制英文: A vocal wobble.
中文: 不确定的语调英文: He became vocal with indignation.
中文: 他因愤慨而变得直言不讳。英文: Mechanism of Vocal-fold Vibration.
中文: 声音交叠振荡的机制。