卡尔。萨根不仅是一位非常成功的科学家和大学教授，他还是一位成功的作家。
Carl Sagan was an extremely successful scientist and university professor. He was also a successful writer.
他不但是一位成功的作家，而且是他那个时代最伟大的诗人。
He was not only a successful writer but also the greatest poet of his time.
他在成为一名作家前是一位成功的商人。
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