Submitted by admin on Sun, 05/04/2014 - 10:28
definition:
The reinforcement or prolongation of sound by reflection from a surface or by the synchronous vibration of a neighbouring object.
sentence:
The researcher believes giraffes may use Helmholtz resonance, causing the air in their long windpipes to vibrate at a low pitch.
difficulty:
medium
toefl frequency:
2
toefl classification: