Assertion: diphthong's vowel | /r/HasProperty | rounded
Facets:
Source sentences:
text: Like many other languages, English does not contrast vowels by liprounding: front and low vowels are unrounded, back nonlow vowels are rounded.
text: The primary acoustic correlate of backness is F2, which is also the primary correlate of rounding (which is why back vowels tend to be round and front vowels tend to be non-round).