The president of the United States is the commander-in-chief of the armed forces.
美国总统是武装部队的总司令。
There'll never be a shortage of people who consider themselves uniquely qualified to be president of the United States.
从不缺乏那种自认为特有资格成为美国总统的人。
At college, Barack Obama didn't know that he would be the first black president of the United States of America.
大学时，巴拉克·奥巴马并不知道他会成为美国第一位黑人总统。
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