翻译下面的句子成中文：“I have a dream that one day this nation will rise up and live out the true meaning of its creed: 'We hold these truths to be self-evident: that all men are created equal.'”
我有一个梦想，有一天这个国家会站起来，活出它的信条的真正含义：“我们认为这些真理是不言自明的：人人生而平等。”