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。
But in thinking about it since, I think that the answer lies in the actions I describe in this article.
但从那以后就开始考虑，我认为答案依赖于本文中所描述的操作。
But I think the real answer lies in our workaholic culture's contempt for a time-waster like sleep.
但是我觉得真正的原因来还是自于美国工作狂文化背景下对于诸如睡觉此类浪费时间的行为的一种蔑视。
The answer lies in the person's life each of us, but also in our hearts.
答案其实就在我们每个人的生活里，更在我们的心里。
The answer lies in the person's life each of us, but also in our hearts.
答案其实就在我们每个人的生活里，更在我们的心里。
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