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现在，科学家们也许找到了这个谜题的答案。当然，我们首先要感谢一项最终揭开了“如何获得一个好的夜晚睡眠”存在了很长时间的神秘问题谜底的研究。
Scientists may now have an answer to this riddle, thanks to a study that cracks open one of the long-standing mysteries of getting a good night's sleep.
这种睡眠病已经在非洲大陆的36个国家存在很长时间了。
The sleeping sickness has been on the continent of Africa for long time in 36 countries.
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