The economic importance of forests has been understood since the dawn of man—wood was the first fuel.
"森林的经济价值自从人类起源之初就已经被人们所认识——木材是最初的燃料。
"Since the dawn of man" is really not that long.
“自从人类出现”其实并非那么久远。
I mean, since the dawn of man, people have been searching for the meaning of life and its creator, so what better way to do that than with a search engine?
就是说，自从人类出现，人们一直在探索生命的意义和它的创造者，因此在搜索引擎上来寻找答案，不失为一种好方法。
Since the dawn of man, it's hardly more than 100 years since we were even allowed into these buildings except to clean them but soon most of law and medical degrees will probably also go to women.
自人类文明以来，在不到100年前，女人在这些学校里，还只能当清洁工，但是不久之后，女性就拿到了大部分的法律、医学学位。
Since the dawn of alcohol, man has been plagued by hangovers.
自酒问世以来，人类便深受宿醉之苦。
Since the dawn of alcohol, man has been plagued by hangovers.
自酒问世以来，人类便深受宿醉之苦。
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