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| 1. | The booking has been open for a few weeks; you're rather optimistic hoping to get a seat at this time |
| 公开订票已有几个星期了，时到今日你还想弄一个座位，未免太乐观了。 |
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| 2. | The booking-list has been open for the past fortnight; you're rather optimistic hoping to get a seat |
| 公开订票已有两个星期了，这个时候你还想买到一个座位，未免太乐观了。 |
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| 3. | Positive results would have been astonishing because as we have seen, even rather optimistic estimates |
| 肯定的结果将会让我们吃惊，因为像我们已经看到的，就乐观的银河系中科技文明社会的数量估计而言，通过随意的星星的选择，为了实现成功目的，这成千上万颗恒星必须被检测到。 |
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