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sound feature produced by the vibration of the larynx (vocal cords). Sounds are
voiceless when vibration is absent. For example, If you have your
students touch their larynx at the same time as saying /z/ or /v/, they will
feel a vibration. On the other hand, if they say /s/ or /f/, no vibration will
be felt. All English vowels are voiced, but some consonants are voiced while
others are not.