Assertion: headphone's sound | /r/HasProperty | necessary cue
Facets:
value: for safety
type: PURPOSE
value: for other reasons
type: CAUSE
Source sentences:
text: Lack of sound from the environment can be a problem when sound is a necessary cue for safety or other reasons, as when walking, driving, or riding near or in vehicular traffic.
text: Lack of sound from the environment can be a problem when sound is a necessary cue for safety or other reasons, as when walking, driving, or riding near or in vehicular traffic.