火箭发射倒计时，一个在二十世纪六十年代广为人知的声音，而这并不只是一次普通发射，而是一个具有历史意义的事件的开始。
A rocket launch countdown. A common sound in the nineteen sixties. But this was not just another launch. It was the beginning of a historic event.
火箭发射倒计时，一个在二十世纪六十年代广为人知的声音，而这并不只是一次普通发射，而是一个具有历史意义的事件的开始。
A rocket launch countdown. A common sound in the nineteen sixties. But this was not just another launch. It was the beginning of a historic event.
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