他说，美国坚定承诺对非洲的帮助。
最糟糕的是，许多人对美国“孩子要比父辈更幸福”的基本承诺已丧失了信心。
Worst of all, many have lost confidence in that fundamental American promise that our children will have a better life than we do.
简报：美国馆对碳中和的承诺。
每一天我们都在履行对美国民众的承诺。
Every day, we are fulfilling the promise we made to the American people.
然而，我们对美国退伍军人还有别的重要道义承诺。
However, we have another major moral commitment to the American veteran.
然而，我们对美国退伍军人还有别的重要道义承诺。
However, we have another major moral commitment to the American veteran.
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