题目内容
Bilabial consonant is produced when the obstruction is partial and the air is forced through a narrow passage.（对外经贸2006研)
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When the vocal folds are apart, the air can pass through easily and the sound produced is said to be voiced.（大连外国语学院2008研)
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English consonants can be classified into two categories: voiced and voiceless consonants.(对外经贸2006研)
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