30.If the President can no longer serve, who becomes President?
30.如果美国总统无法履行职责，由谁替代？
Answer: The Vice President
答案：副总统
Explanation: "The President has been shot!"
解释：“总统被射杀了！”
This phrase, or something similar, has been said many times in U.S. history.
这个句子，或与之类似的句子，在美国历史上提到过很多次了C28oaU,jLjSAJvB+T^。
Being president is a risky job (or a job with many dangers).
担任总统有风险（或危险多的工作）HPrIqfa#x[R。
Many presidents are assassinated (or killed) or simply die while they are in office (or working as president).
许多总统被刺（或被杀）或仅仅是死于任上Fu286cFkm)。
That's why we have to have a plan for who will be the next president if the current president dies.
这就是为什么我们要事先制定计划，一旦总统死了，谁将继任，成为下一任总统5HY[P|u|iDL-X。
When the president can no longer serve (or work), the vice president becomes the next president.
当总统无法履行职责（工作）时，副总统成为下一任总统sGLDN30h;WI*crK+9hd。
To date (or until now), nine vice presidents have become president when the president could no longer serve.
到目前为止（或直到现在），已有九位副总统因总统无法履行职责而继任N0h%DlD;4L。
The first time this happened was in 1841, when President William Henry Harrison died.
第一次发生在1841年，威廉·亨利·哈里森总统死了，
The vice president, John Tyler, had a swearing-in ceremony and took the presidential oath of office, or made a statement promising to do his best while serving as the next president of the United States.
副总统约翰·泰勒宣誓就职，或者发表声明承诺将竭尽全力来当好下一任总统I|&*tav1a_ELz2@t0X%I。
Because the order of succession (or the plan for who will become the next president) was clear, there were no problems.
由于继任次序（或谁将成为下一任总统的方案）清晰，所以没有出现任何异议DuRvHA4Z5B.G*@Saz7。

译文为可可英语翻译，未经授权请勿转载！