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问题: 请求正确翻译,不要翻译器

The clues had been there from the start, when the crew of Apollo 8 became the first humans to leave their home planet's orbit.

解答:

线索从一开始就在那儿了,那时阿波罗8号上的全体成员成为了第一批离开地球轨道的人类。