短语讲解：

1. Late in his presidency, he also suffered from heart disease.

suffer from 患（某种病），受（某种病痛）折磨
例句：I often suffer from unaccountable headaches.
我常莫名其妙地头疼。

2. But questions have arisen throughout American history about what happens when a president is unable to carry out his or her duties, like when under anesthesia.

carry out 进行; 执行; 完成
例句：No matter what we do, we must carry out our duties.
无论干什么工作,我们都应履行自己的职责。
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