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Why A Boy's Voice Changes
為什么男孩會變聲
For adolescent boys, a changing voice that cracks in the middle of a sentence can be a great embarrassment. Though embarrassing, a cracking voice is a natural part of adolescent development. As a boy goes through adolescence, his secondary sex characteristics develop. One of these characteristics is the rapid growth of the larynx and vocal cords.
對于青春期的男孩來說，一句話說到一半突然變聲確實令人尷尬。雖然如此，但這是青春期發育的一個自然的過程。當男孩進入青春期，就會出現第二性征。其中一個特點就是喉結快速增長，聲帶發生變化。
A boy's voice deepens as his larynx develops because the bigger the vocal cords, the deeper the voice. In fact, vocal cords are similar to other musical instruments in this regard. The longer the harp string, for instance, the lower the note it plays. Similarly, if you are blowing into a bottle to create a certain pitch, the larger the bottle, the lower the pitch. When it comes to voices, the bigger the vocal cords, the lower they resonate, and the deeper the voice will be.
隨著喉嚨的發育，男孩的聲音變得低沉，因為聲帶越粗，聲音越低沉。就這一點而言，聲帶其實類似于其它樂器。例如，豎琴的琴弦越長，演奏出來的音符就越低沉。同理，如果向瓶子吹氣來創造音樂的話，瓶身越大，音高就越低。就說話而言，聲帶越大，共振的頻率就越小，于是聲音就越低沉。
But why does a boy's changing voice break and crack? For the same reason growing adolescents are often gangly and awkward: the brain is becoming accustomed to working with bigger body parts. Even for an adult, a consistent and even voice depends on the brain's ability to constantly monitor the sounds that come from the voice.
但為什么男孩會突然變聲？成長中的青少年往往瘦削又笨拙，道理也一樣：大腦還不習慣身體的某個部位變大。即使對于成年人來說，一致平穩的聲音也取決于大腦對聲音的監測和調控能力是否一致。
The brain can do this quite easily under normal circumstances. But, when a boy's vocal cords enlarge, the brain must relearn how to monitor and control the voice. A cracking voice is proof that an adolescent boy's brain hasn't become completely proficient at coordinating its careful monitoring of the sounds coming from the vocal cords.
在普通環境下大腦能非常容易地做到這一點。但當一個男孩的聲帶變大，大腦必須重新學著監控聲音。突然變聲就是青少年的大腦處理聲音不協調的表現，這時大腦還不能很好地協調聲帶傳出的聲音。
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