发，要用上齿咬住下唇，发出类似的音，同样也不振动声带。
For , put your top teeth onto your bottom lip, and make a sound exactly like except voiceless.
因为年龄较大的儿童呼吸道较大，受到类似的感染，他们不会出现特有的哮鸣音。
Because the airways of older children are larger, they do not develop the characteristic wheezing with similar infections.
因为年龄较大的儿童呼吸道较大，受到类似的感染，他们不会出现特有的哮鸣音。
Because the airways of older children are larger, they do not develop the characteristic wheezing with similar infections.
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