甲醛在我们呼吸的空气中自然存在，甚至是我们人体代谢的一部分。
It occurs naturally in the air we breathe and is even part of the human metabolism.
但我们知道，生命最初始于海洋，从第一个奇特的生命体从海洋中冒出来，在空气中呼吸，在类似这里的海滨上呼吸。
Yet we know that life came out of the sea, as the first peculiar living forms flopped out, and gasped in air, on such a beach as this.
生活中确实有很多的事情值得我们感激，我们每日呼吸的空气，我们所居住的城镇，我们赖以生存的工作，在头顶上我们遮风避雨的屋顶。
There truly is so much to be grateful for, the air we breathe, the country we live in, the job that allows us to put food on the table and a roof over our heads.
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