【正确答案】正确答案：When the vocal cords are spread apart, the air from the lungs passes between them unimpeded. Sounds produced in this way are described as voiceless, consonants [ p, s, t ] are produced in this way; but when the vocal cords are drawn together, the air from the lungs repeatedly pushes them apart as it passes through, creating a vibration effect. Sounds produced in this way are described as voiced [ b, z, d ] are voiced consonants.