These early electric guitars were hollow and these early amplifiers caused vibrations in the bodies of the instruments。 It is possible that tubes made from animal bones were used
5. 形容词 [usually ADJECTIVE noun] If you describe a statement, situation, or person as hollow, you mean they have no real value, worth, or effectiveness. Any threat to bring in
in a hollow manner: The politician's accusations rang hollow. Idioms beat all hollow, to surpass or outdo completely: His performance beat the others all hollow.