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.
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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