Then I learned that the problem was acid reflux, a relatively common condition in which stomach acid comes back up the esophagus and scalds the vocal cords, usually during sleep.
后来我了解到起因是胃酸倒流，这是很多人都会碰到的情况：通常在睡觉的时候，胃酸回流经过食道，烧伤了声带。
Lieberman says that, looking back at human evolution, it's evident that after humans diverged from an early ape ancestor, the shape of the vocal tract changed.
利伯曼说，回顾人类的进化过程可以看出，人类与早期类人猿的祖先分开以后，声道的形状改变是很明显的。
I went on to graduate from Carnegie Mellon University with a degree in vocal performance. And it felt like I was back on track.
之后我继续攻读卡内基·梅隆大学声乐表演系，仿佛我又开始一步步走上正轨。
In fact, the 21-year-old right back says when he's not on the pitch he is as vocal as ever.
事实上，这位21岁的右后卫说当他不在场上比赛的时候，他会与往昔一样为球队歌唱加油。
The French central defender enjoyed a fine season last time around but was vocal in expressing his unhappiness at being forced to play out of position at left back for much of the campaign.
法国中卫度过了一个伟大的赛季，但是他对在多数比赛中被安排打不擅长的左后卫感到不高兴。
The French central defender enjoyed a fine season last time around but was vocal in expressing his unhappiness at being forced to play out of position at left back for much of the campaign.
法国中卫度过了一个伟大的赛季，但是他对在多数比赛中被安排打不擅长的左后卫感到不高兴。
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