VOA慢速英语:Why Sleep Apnea Raises Risk of Stroke, Heart Attack

短语讲解：

1. Sleep apnea means that the airway, the upper airway, cuts off at night.

cut off切〔隔〕断, 阻碍
例句：Our troops cut off the enemy's retreat.
我们的军队切断了敌人的退路。

2. So the person, while he's breathing normally in the daytime, when he goes to sleep, the muscles get all relaxed and cut off and this can happen over and over again, sixty to one hundred times an hour.

go to sleep 睡着
例句：I am too excited to go to sleep.
我很兴奋睡不着。
over and over again 一再地
例句：They ran the tapes over and over again.
他们将磁带播放了一遍又一遍。

3. More and more studies show that it can also lead to strokes and heart attacks.

lead to导致, 引起
例句：An ordinary cold can soon lead to a fever.
一场普通的感冒很快便会引起高烧。

4. Whenever we run out of enough air to breathe, it sends alerting signals to our minds.

run out of 用完，耗光
例句：They have run out of typing paper . 
他们的打字纸用完了。

5. This happens again and again with sleep apnea.

again and again再三地, 反复地
例句：This truth has been proved again and again by the facts of history.
这个真相已被历史事实所一再证明。

6. They found that men can experience up to a three-fold increased risk of stroke, and that risk seemed to be well correlated with the severity of sleep apnea.

correlate with把…联系起来
例句：Try to correlate your knowledge of history with your knowledge of geography.
试着把你的历史知识和地理知识联系起来。

7. In other words, the more severe the sleep apnea, the greater the chance of a stroke.

in other words换句话说
例句：He became, in other words, a great hero.
换句话说, 他成了一位伟大的英雄。