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。

youdao

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。

youdao

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。

youdao

The most vocal proponent of cutting back for cardiac reasons is Dr. O'Keefe, a 56-year-old cardiologist and former elite athlete.

WSJ: Endurance Sports: Studies on Older Endurance Athletes Suggest the Fittest Reap Few Health Benefits

Connecticut's Chris Shays, who had threatened to abstain unless the report was released, and New York's Peter King, a vocal Gingrich critic, came back into the fold, both pledging to vote for Newt on Jan. 7.

CNN: The Apology Strategy

Civil rights leaders, highly vocal in past scandals, have held back on criticizing the LAPD this time.

CNN: LA cops stalked by suspect -- and a brutal past