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。
She also had it made known that whoever did guess the answer to her riddle should marry her, no matter who he might be.
她还对大家说，谁答出她的谜语谁就可以娶她，不论那人是谁。
She also had it made known that whoever did guess the answer to her riddle should marry her, no matter who he might be.
她还向世人宣告说，只要是能猜中她谜语的，不管是谁，都可以和她结婚。
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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