The pitch is too high.
The sound is too long.
The volume is too low.
The whistle is too small.
Sounds are changed to electricity.
Sounds make the string vibrate.
Sounds travel through the air.
Sounds travel through the string digitally.
She must have imagined it, because sound cannot travel in water.
The sound would be louder if she raised her head above water.
The sound traveled through the sand on the sea floor.
Water particles vibrated against her eardrum, which caused her to hear the porpoise.
Objects changing shape