Assertion: dolphin's melon | /r/CapableOf | act as acoustic lens
Facets:
value: to focus these outgoing sound waves
type: PURPOSE
Source sentences:
text: They produce a rapid sequence of clicks that pass through the melon, which acts as an acoustic lens to focus the sounds into a beam that is projected forward through the surrounding water.
text: The melon acts as an acoustical lens to focus these outgoing sound waves into a beam, which is projected forward into water in front of the animal.