klingon_story1-6  Exercise 1: A Harsh Sound
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Three features:
  1. retroflex consonants (tongue curled back), for example S and D
  2. uvular consonants (made far back in the throat), for example q and Q
  3. open, lax vowels (e and I), which let the consonants stand out

Missing sounds: the common sounds /k/, /g/, /f/, /h/ and /s/ (and /z/ and the
"sh" sound) are not part of the language.

(From Wikipedia's description of the phonology; I have not heard the language
for this chapter.)