The answer to this riddle lies in the metabolic activity of early photosynthetic life-forms that slowly but surely transformed the chemical composition of Earth's atmosphere.
这个谜题的答案在于早期光合生命形式的新陈代谢活动，这种活动缓慢但一定改变了地球大气的化学成分。
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.
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。
What she was hoping for was that the answer would unriddle the riddle, and bring rest and peace to her perplexed little mind.
她所希望的是妈妈的回答能够解决这个难解之谜，能够为她那困惑的小小心灵带来平静和安宁。
The Castle is a story which Kafka told, or a riddle that Kafka designed delicately, but the answer to which has been lost or there has never been any answer at all.
《城堡》其实就是卡夫卡讲述的一个有关“城堡”的故事，或者说是他精心设计的一个有关“城堡”的谜语，而谜语的谜底早已失落，或者说它根本就不存在。
The Castle is a story which Kafka told, or a riddle that Kafka designed delicately, but the answer to which has been lost or there has never been any answer at all.
《城堡》其实就是卡夫卡讲述的一个有关“城堡”的故事，或者说是他精心设计的一个有关“城堡”的谜语，而谜语的谜底早已失落，或者说它根本就不存在。
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