Assertion: cd | /r/HasProperty | medium
Facets:
Source sentences:
text: For the first few years of its existence, the CD was a medium used purely for audio.
text: In the early 80s, Sony and Phillips introduced the compact disc, a medium that promised the apex of crystalline sound, convenience, and veritable indestructability (or at least imperviousness to the rigors of the "breakfast time test").