Submitted by admin on Tue, 04/22/2014 - 09:22
definition:
A bird’s horny projecting jaws; the horny projecting jaw of animals other than birds, for example a turtle or squid.
sentence:
As a trombone player pulls in the slide to make a higher frequency sound by reducing the volume of the tube, so does a bird open its beak and pull back its head to reduce the volume of its vocal tract.
difficulty:
medium
toefl frequency:
2
toefl classification: