It is the most natural state of man, and therefore the state in which you will find solid Happiness.
它是人类最本能的状态，因此是一种最幸福的生活状态。
The man who broke the sole solid lid is solemnly condemned.
打破这个仅有的实心盖子的人受到庄严谴责。
Biofuels in the solid form has been in use ever since man discovered fire.
自从人们发现火就开始使用固态生物燃料。
Biofuels in the solid form has been in use ever since man discovered fire.
自从人们发现火就开始使用固态生物燃料。
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